The Bay Area has a wide range of campgrounds within a few hours' drive, from foggy coastal bluffs to hot, open oak hills. Camping weather changes a lot with both place and season. The same marine layer that keeps San Francisco gray in July makes coastal camps in Marin cool and misty. Meanwhile, the inland heat that sends East Bay residents to the beach can make a July weekend at an inland park feel like an oven. Good camping weather here mostly comes down to matching the place to the season, and remembering that two campgrounds 20 miles apart can have completely different weather.
Coastal Camping: Marin to Big Sur
Point Reyes National Seashore has four hike-in campgrounds, Coast Camp, Wildcat Camp, Glen Camp and Sky Camp, about an hour and a half from San Francisco. From June through August, these camps sit in the heart of the fog season. Days are often gray and breezy, with afternoon temperatures in the upper 50s to mid 60s. Nights usually drop into the upper 40s or low 50s, and the tent can be wet with fog by morning.
The draw is the scenery, with wild beaches, tide pools and a real wilderness feel close to the city. The best weather comes in September and October, when the fog pulls back and afternoons reach the upper 60s. Those months also bring clear nights, which make for excellent stargazing on this dark stretch of coast.
South of Pacifica, the San Mateo coast follows the same pattern. The campground at Half Moon Bay State Beach draws campers who accept summer fog in exchange for sleeping next to the ocean. A little inland, Butano State Park sits in a redwood canyon near Pescadero, which keeps it cool and shady in summer. If you plan a winter trip, the elephant seal colony at Año Nuevo State Park nearby is busiest from December through March.
Farther south, Big Sur is about three hours from San Francisco. Pfeiffer Big Sur State Park sits in a sheltered river valley set back from the ocean. It is often sunnier and warmer than the foggy coast just over the ridge. Along the whole coast, September through early November brings the clearest, warmest and driest camping before the winter rains start.
Inland Camping: Mount Diablo, Henry Coe, and the Delta
Mount Diablo State Park in the East Bay has campgrounds from about 1,500 feet to roughly 3,000 feet, near the Juniper area. Summer days there are hot, especially at the lower sites, though nights cool off well, particularly higher up. Fall is the best season, with afternoons in the mid 60s to mid 70s, long views and nights cool enough for a warm sleeping bag. Spring is also lovely, when the hills turn green and wildflowers cover the slopes.
Henry W. Coe State Park, east of Morgan Hill, is the largest state park in Northern California and one of the region's most rugged places to backpack. In July and August, the low canyons can top 100°F, so summer trips there suit only experienced, heat-ready hikers. Spring, from March through May, brings green hills and wildflowers. Fall, from October through November, brings cooler days and golden grass. In dry winters, Coe can also be excellent, with mild days, green slopes and very few other people on the trails.
Del Valle Regional Park, south of Livermore, is another warm inland option, with a campground beside a reservoir. Out in the Delta, Brannan Island State Recreation Area near Rio Vista sits right on the water. Summer days there are hot, but the Delta breeze often picks up in the afternoon and cools the evening. The sea breeze plays the same role at many inland camps, so a hot afternoon usually gives way to a pleasant night.
Wine Country and North Bay Camping
The North Bay has its own mix of camping weather. Sugarloaf Ridge State Park near Kenwood, in Sonoma County, and Bothe-Napa Valley State Park near Calistoga both sit in warm inland valleys. On summer afternoons, Santa Rosa and Napa often run 15 to 20 degrees warmer than San Francisco. The coast near Bodega Bay brings the fog right back. Fall is the sweet spot in the valleys, when harvest season brings warm afternoons, cool nights and changing colors in the vineyards.
Farther north, the redwood parks of Humboldt and Del Norte counties are four to six hours from the Bay Area. The long drive pays off, because they rank among California's most memorable places to camp. Humboldt Redwoods and Prairie Creek Redwoods state parks stay cool and often foggy all summer. If you like fog rather than mind it, a summer night under the giant trees is hard to beat.
Best Months to Camp by Location Type
For coastal Marin and Point Reyes, September and October offer the clearest skies and most comfortable temperatures. For inland parks such as Mount Diablo and Henry Coe, spring and fall are the best choices, since summer is too hot for comfortable hiking during the day. For wine country and the North Bay valleys, fall lines up with harvest and the best weather of the year. On the coast south of the city, summer fog is steady but manageable with the right gear, and September usually brings a welcome break.
Expect cool nights wherever you camp in the Bay Area. Even in the hottest weeks of summer, most campgrounds drop into the low to mid 50s overnight, and coastal sites often reach the upper 40s. A sleeping bag rated to about 35°F to 40°F works for most camping from spring through fall.
Winter calls for warmer gear, because inland sites can fall into the mid 30s on clear nights. A bag rated to 20°F to 30°F is safer from December through February. Rain is the bigger challenge, because most of the year's rain falls from November through March. A waterproof tent, a rain fly and a dry change of clothes matter more than almost anything else. Between storms, though, winter brings green hills, quiet trails and easy-to-book campsites, and many Bay Area campers count it among their favorite seasons.
