Sebastopol Weather

April is Sebastopol's peak month, with an average comfort score of 93, highs around 76°F, and minimal morning fog at just 0.6 hours per day. May runs a close second at 91 comfort with 12.8 hours of daily sunshine. If you're visiting in summer, July and August provide consistent warmth and long sunny days, though you'll experience slightly more morning fog. The shoulder months of March and September also perform well with comfort scores in the mid-80s and pleasant conditions for exploring the town. September's 85 comfort score combined with 71°F highs makes it one of the better times to visit before fall rain arrives. Check the Bay Area four-season pattern to understand why these specific months shine.

Sebastopol sits about 15 miles inland and feels noticeably warmer than coastal towns like Bodega Bay or Jenner. Summer highs reach the low 80s here while coastal areas often max out in the 60s. The key difference is morning fog: Sebastopol experiences only 1.5 to 2 hours of morning fog even in summer, while coastal areas can be socked in for half the day. This warmth and extra sunshine make Sebastopol ideal if you want inland summer heat without driving too far from the ocean. The trade-off is occasional afternoon wind that can pick up, especially in warmer months. Sebastopol's 9.3 hours of daily sunshine average significantly exceeds what you'd find on the immediate coast, making it genuinely sunnier. This is part of why the Bay Area has so many microclimates, with dramatic shifts within just a few miles.

Outdoor dining works brilliantly from April through October, when temperatures range from 65-80°F and afternoon sunshine is abundant. The summer months are peak season, with June through August providing reliable warmth and minimal rain. Even shoulder months like March and May are pleasant, though you might want a light jacket for evening meals. Winter months (November-February) are trickier, with highs in the 58-65°F range and frequent rain, so heated or covered seating becomes essential. That said, Sebastopol's average of 9.3 hours of daily sunshine means you'll find more sunny lunch days here than in foggier Bay Area locations, making it genuinely appealing for eating outdoors. April's weather is nearly unbeatable, with 12.9 hours of daily sun and almost no fog.

January is Sebastopol's wettest month with 8.82 inches of rain, followed closely by October and November with over 7 inches each. The broader rainy season runs from October through March, with the heaviest downpours typically in January and February. Summer months are virtually dry, with July, May, and April getting almost no measurable rain. If you're planning a visit, avoid late fall and winter unless you're prepared for gray, rainy conditions. The good news: Sebastopol averages about 271 perfect days per year, so despite roughly 69 rainy days, you'll have plenty of dry stretches even in the wetter months. Understanding the rainiest month in the Bay Area shows that January weather affects the entire region, not just Sebastopol.

Summer in Sebastopol calls for light, breathable clothing during the day, but always pack a layer for mornings and evenings. Daytime highs reach 80-85°F in July and August, but because of coastal influence and the town's modest elevation at 92 feet, it rarely gets oppressively hot. The real consideration is dressing in layers, a principle that applies throughout the Bay Area. Morning fog can linger until mid-morning, bringing temperatures down to the 55-60°F range. I'd recommend bringing a lightweight jacket, sweater, or denim you can shed by afternoon. Sunscreen and sunglasses are essential given the 11-12 hours of daily sunshine in June and July. Closed-toe shoes work fine for town exploring, and you'll appreciate pockets for carrying layers as the day warms.

Sebastopol averages 9.3 hours of sunshine daily over the year, which is genuinely excellent for the Bay Area. Summer months are exceptional, hitting 12.8-12.9 hours in April and May, and staying above 10.5 hours through August. This abundance of sun is one of Sebastopol's biggest advantages, especially compared to foggier coastal and bay shoreline areas. Even winter months get 6-8 hours of daily sun, far better than you'd expect for the season. The consistent sunshine makes the town feel warmer and more inviting than its raw temperatures suggest. This is partly why Sebastopol has such a high average comfort score of 83 overall, and why April and May consistently stand out despite moderate temperatures compared to summer months.

Sebastopol definitely experiences morning fog, but far less than coastal areas. Over 18 months of observation, the town averages 2.1 hours of morning fog daily, which is relatively light. Summer months show the most fog, peaking at 3 hours in June and 3.7 hours in October, likely from cool coastal air moving inland overnight. Despite this, mornings typically clear by mid-morning as inland warming kicks in. Compare this to Bodega Head or other coastal spots that can stay fogged until afternoon, and you'll see Sebastopol's advantage. If you're bothered by morning fog, avoid June and October when it's heaviest, and plan outdoor activities for after 10 AM. Learn how fog forms to understand why this time of year brings more morning cover.

Sebastopol's summer highs typically max out in the 80-85°F range, with July and August averaging around 82-83°F. This is warm but not extreme for California. The data suggests heat waves aren't common here, as temperatures rarely spike into the 90s. The highest average high in the dataset is 85.7°F in June 2024. This moderate warmth reflects Sebastopol's slightly cooler character compared to inland valleys that regularly hit 95°F+. The prevailing coastal influence keeps it pleasant rather than punishing. If you're chasing heat, you'll find warmer spots to the east, but if you want warm weather without oppressive heat, Sebastopol's range is ideal for comfortable exploring and outdoor dining. Interestingly, September can actually feel warmer than July in parts of the Bay Area.

Late April through May is your sweet spot for consistently perfect conditions. April's 93 comfort score reflects ideal temperatures (mid-70s), abundant sunshine (12.9 hours daily), virtually no morning fog at just 0.6 hours, and almost no rain. May matches April's sunshine and adds slightly warmer temps while keeping fog minimal at 1.4 hours. Early fall in September also delivers an 85 comfort score with pleasant 71°F highs and manageable conditions. July and August are reliably warm and sunny, but they bring slightly more morning fog and occasional marine layer carryover from overnight. If you prefer milder, fog-free conditions over peak warmth, April-May wins. If you want warmth without caring about fog, stick with July-August. These months justify Sebastopol's reputation as a year-round destination.

Sebastopol follows a predictable seasonal rhythm. Spring (March-May) brings rapid warming from the 60s into the 70s, with increasing sunshine and minimal rain. Summer (June-August) locks in 80-85°F warmth with long sunny days but some morning fog and occasional afternoon wind. Fall (September-November) starts pleasant and gradually cools from 71°F in September to highs in the high 50s by December, with increasing rain from October onward. Winter (December-February) settles into 58-65°F with frequent, heavy rain. Nearby towns like Graton and Forestville experience similar patterns, though they're equally prone to fog. If you want to escape winter rain while staying locally, the pattern suggests checking conditions day-by-day rather than avoiding the season entirely, as clear days still occur.

Sebastopol experiences wind, though it's less notorious than hilltop or coastal areas. Summer months occasionally bring afternoon wind as the inland valley heats up and pulls marine air inland. Fall and spring can also be windy as weather systems move through. The data doesn't show consistently extreme wind speeds, suggesting it's a moderate concern rather than a deal-breaker. If wind bothers you, plan outdoor activities for early morning, which tends to be calmer. Late spring and early summer mornings are typically the most wind-free. For more context on why wind affects the broader Bay Area, check out the Bay Area wind patterns. Sebastopol's position inland but protected by surrounding terrain means you'll experience some wind without it dominating your experience, making it noticeably calmer than Occidental or other exposed ridgetop areas.