San Pablo Weather

April is the standout month in San Pablo. The data backs this up clearly: April 2025 logged an average high of 72.9F, a comfort score of 91 out of 100, and only 0.17 inches of rain across the entire month. Morning fog dropped to just 0.7 hours per day, which is unusually low for the East Bay flatlands. You get long sunny days averaging 12.8 hours of sunshine without the heat that July sometimes brings. July and September are close runners-up, both scoring 88 on the comfort scale with highs in the mid-to-upper 70s. The summer months hold up well too, but April has a particular sweetness to it: the hills behind the Bay are still green, rain is almost done, and the temperatures are warm without ever feeling oppressive. If you can pick one month to spend time outdoors in San Pablo, April is it.

San Pablo runs warm in summer but rarely tips into uncomfortable territory. July is typically the hottest stretch, with average highs around 76 to 77F and lows staying in the mid-50s. The town sits at only 62 feet of elevation in the North Bay flatlands, so it catches more warmth than hillside or coastal locations. That said, it is sheltered enough from direct Bay breezes that it avoids the wind chill that can make summer afternoons uncomfortable in Richmond or Albany. August highs sit around 74 to 75F. Extreme heat events do happen across the Bay Area, but San Pablo's location keeps it from becoming a heat trap. Most summer days land in the pleasant range, and the comfort scores from June through August all come in at 85 or higher. For residents who want warmth without punishing heat, the summer pattern here is genuinely reliable.

San Pablo winters are mild by most standards, though they have a dampness that requires the right gear. Average lows in December and January hover around 44 to 47F, with highs typically in the upper 50s. Frost is rare at this low elevation, and snow is essentially unheard of. The real story in winter is rain: November is the wettest month, averaging close to 6 inches, and January typically brings another 5 or so inches. Comfort scores dip noticeably during these months, hitting the low 60s in November 2025 and the low 70s in January. That is less about cold and more about persistent overcast skies and wet days. Sunshine hours fall to around 6 per day. It is the kind of winter where a rain jacket and waterproof shoes matter more than a heavy coat. The Bay Area four seasons article breaks down this pattern well if you want a broader picture.

Yes, San Pablo sees morning fog, though not as dramatically as coastal communities. The 18-month average works out to about 2.3 hours of fog per morning. Summer months see moderate fog, typically around 2 hours per day in July and August, while fall can actually bring more, with October 2025 logging 3.5 hours and November 2025 reaching 3.9 hours. April is the clearest month, with fog averaging just 0.7 hours. The fog here generally clears by mid-morning, which is typical of inland Bay flatland communities. San Pablo is not sitting in the direct fog channel that funnels marine air through the Golden Gate, so it misses the deep fog that rolls into parts of the inner East Bay. For a deeper look at why this pattern exists, why morning fog forms in the Bay Area is worth reading.

San Pablo follows the classic California Mediterranean pattern: wet winters, dry summers. The data shows about 68 rainy days per year. The rain is concentrated almost entirely from October through February, with November consistently being the wettest month at around 6 inches. October brings the first real rains of the season, January stays wet, and February begins to taper off. Then something notable happens: March, April, and May see a sharp drop, and by June the rain essentially stops. June through September typically record zero to trace precipitation. This means if you are planning outdoor activities or events, summer in San Pablo is remarkably predictable. The dry season lasts roughly five months. The rainiest month in the Bay Area article goes deeper on this seasonal rhythm and how the Bay Area compares to other California regions.

For most of the year, yes. The window from March through October is genuinely comfortable for eating outside. April through September is the sweet spot: highs in the high 60s to upper 70s, minimal rain, and enough sunshine to make a patio feel pleasant well into the evening. July and August evenings cool into the upper 50s, so a light layer helps after sunset, but afternoons are warm and inviting. The winter months present more of a challenge. November and December are the least comfortable for outdoor dining, with more overcast days, rain, and highs only in the mid-to-upper 50s. That said, a covered or heated patio extends the season considerably, and even January occasionally delivers a pleasant sunny break with highs approaching 60F. San Pablo's location in the East Bay flatlands means it avoids the persistent coastal chill that makes outdoor dining trickier in places like El Cerrito on foggy afternoons.

Layering is the essential strategy for San Pablo, as it is for most Bay Area destinations. Even in summer, mornings can start in the mid-50s before warming into the 70s by afternoon, so carrying a light jacket or fleece until the day heats up is standard. In spring and fall, a medium-weight layer works well, and a packable rain jacket is smart from October through April. The dressing in layers for Bay Area weather guide covers this logic in more detail, but the short version for San Pablo is: you rarely need a heavy coat, but you also rarely want to commit to just a t-shirt in the morning. Summer afternoons call for sun protection since San Pablo gets close to 12 hours of sunshine per day in peak summer. In winter, waterproof shoes and a rain layer matter more than insulation. San Pablo does not get the biting wind that affects more exposed East Bay hillside spots.

San Pablo sits in a middle ground between Richmond's more wind-exposed bayside position and the hillside neighborhoods of El Cerrito. Richmond, being closer to the Bay and more exposed, tends to catch stronger afternoon winds and more pronounced marine influence. San Pablo's flatland location at 62 feet gives it a bit more warmth on summer afternoons and a bit less wind than Richmond near the waterfront. In practice, the differences are modest day to day, as both communities share the same general East Bay microclimate. But on those warm, calm September days when San Pablo scores 88 on the comfort scale, the distinction from a breezy Richmond waterfront afternoon is noticeable. The Bay Area microclimates article explains the geographic forces that create these variations across short distances.

San Pablo averages about 9.4 hours of sunshine per day across the year, and the data shows roughly 245 days per year that qualify as pleasant or better. The sunniest months are May and April, with May logging 13 hours per day and April close behind at 12.8 hours. June through August hold up well at 10 to 12 hours per day, though June can see slightly reduced sunshine as marine clouds push inland. Winter is the obvious contrast: November and December typically average around 5.9 to 6.2 hours of sunshine per day. That still means you get some sun even in the worst months, which sets the Bay Area apart from cloudier winter climates further north. The overall picture is a reliably sunny location for most of the year, with a wet, dimmer window from November through January. For a flatlands East Bay community, 245 good days per year is a strong showing.

Spring edges out fall, particularly April and May. April is the top-rated month in the data with a comfort score of 91, and May follows close behind at 87. Rain is tapering off, fog is minimal, and the days are long and clear. You get mild warmth without the occasional heat spikes that push some summer days into the high 70s. Fall has its own appeal: September is genuinely excellent, scoring 88 on comfort with highs around 69 to 77F and very little rain. September in San Pablo has a dry, warm quality that feels like an extension of summer. But October marks a sharp transition, with rain arriving and comfort scores dropping into the mid-70s. Fall is excellent if you can catch it early, but it ends quickly. Spring builds gradually toward beautiful conditions and then holds steady through May. For visiting Wildcat Canyon Regional Park nearby, spring also has the added benefit of green hills before the summer dry season turns the grass golden.