Channel Islands National Park by Month: Weather, Water, Ferries & When to Go (2026)
Channel Islands National Park · every month
Pick a month. Cross the channel in it.
Average temperatures from NOAA, daylight from the sun's math, ferry and closure rules from the park's own pages. Choose a month and the page becomes what the islands are actually like then: the air, the water, the fog, and who else is on the boat.
average highaverage lowprecipitationsnowhours across the top = daylight
Santa Barbara 11 W, Ca Us, 20 ft (NOAA 1991-2020 normals, station USW00053152). Tap a column or pick a month below.
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Showing all twelve months. Pick one and the page becomes that month.
Last updated September 3, 2026 How we research
Channel Islands is the rare park where the air temperature barely matters. NOAA's normals for the Santa Barbara station run from a January high of 63 to an August high of 72, a spread most parks cover in a single afternoon. What changes across the year is everything else: winter rain, spring fog, the wind that builds every summer afternoon, and above all the ocean, which warms from about 55 degrees in January to about 70 in September and decides how thick a wetsuit you need and whether the ferry sails at all.
The chart shows the whole year. Below it, every month has the same answers: what the weather feels like, how much daylight you get, what is open and how far ahead to book the boat, how busy it is, and what to do. Every trip starts in Ventura Harbor, there is no entrance fee, and the crossing takes one to three hours depending on the island, so the month you choose is really a choice about sea state, water temperature and which animals are in the channel.
Does it snow?
No. At sea level the islands get rain, not snow, and NOAA's normals for the Santa Barbara station record no measurable snow in any month. Roughly 95 percent of the year's rain falls November through April, with January (4.7 inches) and February (4.3 inches) the wettest and together accounting for about 45 percent of the annual total. May through October is essentially dry: July, August and September each average less than a tenth of an inch. The weather that closes the park is not snow but wind, fog and high seas, which can cancel a ferry with hours of notice in any month.
Channel Islands National Park in January
January: the wettest month, the coldest water, and the fewest people
Highs in the low 60s and lows in the low 40s, with the year's heaviest rain arriving in Pacific storm systems. The ocean is at its coldest, the ferries cancel when seas build, and the islands are as empty as they get all year.
- 64° / 43°avg high / low
- 10.1 hdaylight, 7:05 am to 5:12 pm
- 4.7 inprecipitation
What’s open
- Island Packers runs year-round to all five islands, but January storms can cancel sailings on short notice for high seas; confirm your reservation 24 to 48 hours before departure.
- Off-season ferry seats are easy to get and the old page notes the year's lowest ferry prices; accommodations on the mainland book easily too.
- There is no entrance fee for the park; ferry fares are paid separately to the operator.
How busy
Lowest crowds of the year, December through March.
Best for
- solitude
- tidepooling
- gray whales
What to do
- Watch the southbound gray whale migration from the boat; it runs December through January.
- Tidepool on afternoon low tides: winter is peak tidepooling season for clear water and exposed pools.
- Northern elephant seals are in breeding season, which peaks December through March.
Pack
- A real rain shell and warm layers for a cold, wet crossing
- A 5 to 7 mm wetsuit if you are getting in 55 to 60 degree water
- Tide tables and grippy shoes for the pools
Channel Islands National Park in February
February: still the rainy season, but the whales turn north
Nearly as wet as January and just as cool, with lows in the mid 40s. The difference is direction: the gray whales begin their northbound run, and in years of normal rain the hills start to green and flower.
- 62° / 44°avg high / low
- 11.0 hdaylight, 6:46 am to 5:43 pm
- 4.3 inprecipitation
What’s open
- Year-round ferry service continues, with the same storm caveat: high seas cancel sailings with little warning, so confirm 24 to 48 hours ahead.
- Water stays in the 55 to 60 degree range, the coldest of the year, and snorkeling or diving means a thick 5 to 7 mm wetsuit.
- No entrance fee; nothing to reserve except the boat and, if you camp, your site.
How busy
Still the low season. Weekday boats can be nearly empty.
Best for
- gray whales
- wildflowers
- low crowds
What to do
- Gray whale watching: the northbound migration peaks February through May.
- Tidepooling on afternoon low tides while winter water is clear.
- Look for wildflowers on the islands in normal-rainfall years.
Pack
- Waterproof layers for rain and spray
- Binoculars for whales from the deck
- Warm hat: the wind is west-northwest at 10 to 20 mph on average
Channel Islands National Park in March
March: the rain tapers, the fog begins, the birds start nesting
Highs in the mid 60s and about twelve hours of daylight. March is the last month of real rain, the first month the morning marine layer becomes a regular feature, and the month the seabirds claim their nesting cliffs.
- 65° / 46°avg high / low
- 11.9 hdaylight, 7:12 am to 7:07 pm
- 3.3 inprecipitation
What’s open
- Seabird nesting begins in March and triggers seasonal closures of nesting areas; shorebird (snowy plover) closures restrict some beaches March 1 through September 15.
- Shoulder-season ferry booking: 2 to 3 weeks ahead is the old page's guidance for March through May.
- Water is about 56 degrees; a 5 to 7 mm wetsuit is still the call.
How busy
Low to shoulder; picks up toward the end of the month.
Best for
- wildflowers
- whales
- quiet trails
What to do
- Gray whales northbound, still at peak.
- Wildflower season on the islands runs through March in normal rainfall years.
- Plan hikes and photos for the afternoon, when the morning fog usually clears.
Pack
- A shell for rain that may or may not come
- Layers for a foggy morning and a sunny afternoon
- Binoculars for nesting cormorants, pelicans and oystercatchers
Channel Islands National Park in April
April: dry-season shoulder, with fog on the water
Rain drops to about an inch and the days stretch to thirteen hours, but the mornings are often gray under a dense marine layer. The water begins to warm and the whales are still moving north. Easter week brings the first families of the year.
- 65° / 48°avg high / low
- 13.0 hdaylight, 6:30 am to 7:30 pm
- 1.0 inprecipitation
What’s open
- Ferry booking 2 to 3 weeks ahead; morning fog and afternoon wind can still cancel sailings, so confirm 24 to 48 hours out.
- Nesting-area closures are in force on some islands from March into summer; shorebird beach closures run through September 15.
- Water is in the 60 to 65 degree range by late spring, which the old page puts in 3 to 5 mm wetsuit territory.
How busy
Shoulder season; Easter week is noticeably busier.
Best for
- shoulder-season quiet
- hiking
- last of the gray whales
What to do
- Gray whales northbound through May.
- Hike the island overlooks in the afternoon as the fog lifts; exposed western islands stay foggier longer.
- Watch the seabird colonies from the trail without approaching them.
Pack
- Layers for a 20-degree swing between foggy dock and sunny ridge
- A 3 to 5 mm wetsuit for anything in the water
- Two to three liters of water per person: most islands have none
Channel Islands National Park in May
May: the fog peaks, the kelp forest wakes up
Highs near 68 and less than half an inch of rain, but May and June are the foggiest months of the year, with a dense morning marine layer over the coast and islands. Under the surface, spring upwelling brings cold, nutrient-rich water and the kelp forest comes alive.
- 68° / 51°avg high / low
- 13.9 hdaylight, 5:59 am to 7:53 pm
- 0.5 inprecipitation
What’s open
- Ferry booking 2 to 3 weeks ahead for May; peak-season booking windows start in June.
- Fog typically clears by afternoon but can last all day, reducing visibility above and below the water; plan snorkeling and photography for the afternoon.
- Nesting closures continue; shorebird beach closures through September 15.
How busy
Shoulder season; weekends fill before weekdays.
Best for
- kelp forest snorkeling
- long days
- shoulder-season prices
What to do
- Snorkel the kelp forest as visibility improves with the upwelling; water is 60 to 65 degrees, so bring the 3 to 5 mm suit.
- Catch the tail end of the northbound gray whale migration.
- Hike the ridgelines once the marine layer burns off.
Pack
- A 3 to 5 mm wetsuit
- A warm layer for the foggy morning crossing
- Polarized sunglasses for glare when the sun breaks through
Channel Islands National Park in June
June: peak season begins, and the big whales arrive
The longest days of the year, with sunset after 8 pm, and almost no rain. Mornings are still foggy, afternoons are windy, and the channel fills with feeding blue and humpback whales while the sea lion rookeries fill with pups.
- 68° / 54°avg high / low
- 14.4 hdaylight, 5:48 am to 8:12 pm
- 0.1 inprecipitation
What’s open
- Peak-season ferry booking: reserve Island Packers 3 to 4 weeks ahead for June through August, and still confirm 24 to 48 hours before sailing.
- Afternoon west-northwest winds of 10 to 20 mph are the summer pattern; morning departures are calmer.
- Water warms to 61 to 66 degrees, which the old page rates as 2 to 3 mm wetsuit or rash-guard water for most people.
How busy
Peak season starts; June through August are the busiest months.
Best for
- blue and humpback whales
- sea lion pups
- longest days
What to do
- Whale watching from the crossing: blue and humpback whales feed in the channel June through August.
- See California sea lions at peak pupping season, from the required 25 yards.
- Snorkel and kayak on calm mornings before the wind builds.
Pack
- A wide-brim hat and polarized sunglasses
- A rash guard or thin wetsuit
- A windproof layer for the afternoon deck
Channel Islands National Park in July
July: warm, dry, windy afternoons and full boats
Highs around 71, lows in the upper 50s, and 0.05 inches of rain on average. The fog thins toward midsummer, the water climbs into the 62 to 68 range, and every ferry seat is spoken for weeks ahead.
- 71° / 57°avg high / low
- 14.2 hdaylight, 5:59 am to 8:12 pm
- 0.1 inprecipitation
What’s open
- Ferry reservations are mandatory and peak-season boats fill 3 to 4 weeks ahead; arrive at Ventura Harbor 1 to 2 hours early because parking fills and boarding takes time.
- Seabird nesting closures run through July; shorebird beach closures through September 15.
- As of the park's July 2026 notices, Santa Rosa Island reopened July 1 for day use only with camping closed for wildfire recovery, and Santa Barbara Island's dock was closed with landings on the adjacent rocky ledge. Check current conditions before booking.
How busy
Peak. Book the boat 3 to 4 weeks out and arrive early for harbor parking.
Best for
- sea caves
- snorkeling
- whales
What to do
- Kayak the sea caves on a morning departure before the afternoon wind.
- Snorkel the kelp with 70 to 100 foot visibility in a thin suit or rash guard.
- Blue and humpback whales at peak feeding; sea lion pupping continues.
Pack
- Two to three liters of water per person and all your own food
- Reef shoes for rocky landings and tidepools
- A light jacket: ocean wind makes the deck cool even at 71 degrees
Channel Islands National Park in August
August: the driest month and the calmest seas of summer
The warmest air of the year at a 72 degree high, 0.03 inches of rain, and the lowest winds of the summer. The old page calls August the best month for kayaking and sea caves, and the water reaches 64 to 70 degrees by the end of the month.
- 72° / 56°avg high / low
- 13.5 hdaylight, 6:21 am to 7:49 pm
- 0.0 inprecipitation
What’s open
- Ferry-only access from Ventura Harbor; peak-season boats book 3 to 4 weeks ahead and trips run 1 to 3 hours each way, so plan 4 to 6 hours for a day visit including the crossing.
- As of July 2026: Santa Rosa Island day use only, with Water Canyon Campground and burned areas closed through at least August 13; Santa Barbara Island dock closed, landings via the rocky ledge. Verify before you book.
- No entrance fee. The Ventura Harbor visitor center has restrooms, water and a bookstore but sells no food.
How busy
Peak summer visitation, though ferry capacity keeps the islands themselves far less crowded than mainland parks.
Best for
- kayaking
- sea caves
- warm water
What to do
- Kayak and explore sea caves on the calmest seas of the year.
- Snorkel Anacapa's coves and the Santa Cruz nearshore kelp in warm, clear water.
- Climb Anacapa's 157 stairs to the island top for Arch Rock and the lighthouse; sunrise light on the cliffs is the photographers' hour.
Pack
- A rash guard or 2 to 3 mm wetsuit
- A hat, polarized sunglasses and a long-sleeve sun layer
- Sturdy broken-in shoes for rocky, exposed trails
Channel Islands National Park in September
September: the best single month, by the old page's own reckoning
Air near 71, water at its yearly peak of 65 to 70 degrees, visibility of 90 to 100 feet, calm seas and minimal fog. The summer crowd thins after school starts while the conditions get better, not worse.
- 71° / 56°avg high / low
- 12.4 hdaylight, 6:42 am to 7:08 pm
- 0.1 inprecipitation
What’s open
- Shoulder-season ferry booking of 2 to 3 weeks ahead for September and October; still confirm 24 to 48 hours out.
- Shorebird beach closures end September 15.
- Camping on the islands reopens to normal planning where closures have lifted; check the park's current conditions page for Santa Rosa and Santa Barbara before booking.
How busy
High shoulder: still busy, but well below July and August.
Best for
- snorkeling and diving
- fewer people
- warmest water
What to do
- Snorkel and dive: the warmest water and clearest visibility of the year.
- Watch humpbacks on their southbound migration, which continues through November.
- Elephant seals return to the beaches from August onward.
Pack
- A 2 to 3 mm wetsuit or rash guard
- Snorkel gear, rented in Ventura if you do not own it
- A headlamp: sunset is back near 7 pm
Channel Islands National Park in October
October: summer conditions, autumn crowds
Highs still near 72 but nights cooling into the low 50s, with the first light rain of the season at under an inch. Seas stay calm, fog stays minimal and visibility is still around 100 feet, while the boats get quieter each week.
- 72° / 51°avg high / low
- 11.4 hdaylight, 7:04 am to 6:27 pm
- 0.8 inprecipitation
What’s open
- Ferry booking 2 to 3 weeks ahead; the first fall systems can cancel sailings, so confirm 24 to 48 hours before departure.
- Water eases to 60 to 65 degrees, back into 3 to 5 mm wetsuit range for most people.
- No seasonal beach closures after September 15.
How busy
Shoulder season and thinning.
Best for
- diving
- hiking
- quiet
What to do
- Dive and snorkel in the year's calmest, clearest water before winter storms arrive.
- Hike the long island trails in mild air with the summer wind gone.
- Watch for southbound humpbacks and returning elephant seals.
Pack
- A 3 to 5 mm wetsuit
- Layers for cooler nights
- Binoculars for whales and seals
Channel Islands National Park in November
November: the rainy season returns and the crowds leave
Highs fall to the upper 60s and lows to the mid 40s, sunset slides back before 5 pm, and the first real rain arrives. The water is still in the low 60s, but the ferry calendar starts to answer to storms again.
- 68° / 46°avg high / low
- 10.4 hdaylight, 6:32 am to 4:58 pm
- 1.2 inprecipitation
What’s open
- Year-round ferry service continues with fewer sailings and more weather cancellations; confirm 24 to 48 hours before departure.
- Water in the 60 to 65 degree range means a 3 to 5 mm wetsuit.
- Ferry seats and mainland lodging are easy to book.
How busy
Low to shoulder; estimate based on the old page's season table.
Best for
- low crowds
- humpbacks
- hiking
What to do
- Humpback whales pass southbound through November.
- Hike in cool, clear air between fronts.
- Tidepool as the winter low tides return.
Pack
- A rain shell and a warm mid-layer
- A headlamp for a 5 pm sunset
- A 3 to 5 mm wetsuit if you are getting in
Channel Islands National Park in December
December: short days, cold water, and the elephant seals come ashore
The coolest nights of the year at a 42 degree low and the shortest days, with sunset before 5 pm. Rain returns in earnest, the ocean drops toward its winter floor, and the beaches fill with breeding elephant seals while the gray whales begin passing south.
- 63° / 42°avg high / low
- 9.9 hdaylight, 6:58 am to 4:52 pm
- 2.8 inprecipitation
What’s open
- Ferries run year-round, but winter storms cancel on short notice; confirm 24 to 48 hours before departure and keep a flexible day.
- Winter water in the 55 to 60 degree range calls for a 5 to 7 mm wetsuit.
- No entrance fee, easy ferry availability, and mainland lodging without competition.
How busy
Low season begins; the quietest stretch runs December through March.
Best for
- elephant seals
- solitude
- gray whales
What to do
- Gray whale watching begins in late December as the southbound migration starts.
- Northern elephant seals are visible from December, with breeding peaking December through March.
- Tidepool on clear-water afternoon low tides.
Pack
- Full rain gear and warm layers for the crossing
- Binoculars
- A thermos and a headlamp: dark before 5
Which month is yours?
Questions people ask about Channel Islands’s seasons
What is the best time to visit Channel Islands National Park?
August through October, for the warmest water at 65 to 70 degrees, the calmest seas, minimal fog and visibility of 90 to 100 feet. September is the best single month. If you are coming for whales rather than water, February through May is the northbound gray whale peak and June through August is when blue and humpback whales feed in the channel.
When is the best time to snorkel and kayak at Channel Islands?
August through October. August has the calmest seas and lowest winds of summer, which makes it the best month for kayaking and sea caves. Water peaks at 65 to 70 degrees in late August and September with 90 to 100 foot visibility, and a 2 to 3 mm wetsuit or rash guard is enough for most people.
Is winter a good time to visit Channel Islands?
Yes, if you want the islands to yourself. January and February have the lowest crowds, the year's best tidepooling on afternoon low tides, peak gray whale migration, and the lowest ferry prices. Expect 4 to 5 inches of rain a month, 55 to 60 degree water that needs a 5 to 7 mm wetsuit, frequent fog and wind, and the occasional ferry cancellation for high seas.
When is the fog worst at Channel Islands?
May and June. A dense morning marine layer sits over the coast and islands and usually clears by afternoon, but it can last all day and cuts visibility above and below the water. Plan photography and snorkeling for the afternoon. Fog is minimal in September and October.
What wetsuit do I need for Channel Islands?
It depends on the month. Water runs from about 55 degrees in January to 70 in September. January through March at 55 to 60 degrees calls for 5 to 7 mm; April, May, October and November at 60 to 65 degrees for 3 to 5 mm; June through September at 65 to 70 degrees for 2 to 3 mm or a rash guard.
How far ahead do I need to book the ferry?
Island Packers runs year-round to all five islands from Ventura Harbor. Book 3 to 4 weeks ahead for June through August and 2 to 3 weeks for the March to May and September to October shoulders. In any month, confirm 24 to 48 hours before departure, because high seas, fog and wind cancel sailings with little warning. Crossings take 1 to 3 hours depending on the island.
No month on this page carries a first-person visit. Every month is built from NOAA normals for the Santa Barbara 11 W station, the sun's position over the islands, and the park's published ferry, closure and wildlife dates as captured in the site's earlier pages, not from a trip, and the page says so where it matters. Temperatures: Santa Barbara 11 W, Ca Us, 20 ft (NOAA 1991-2020 normals, station USW00053152).
