San Francisco Bay South of the Bay Bridge Marine Forecast
| Tonight...W Wind 10 To 15 Kt, Easing To 5 To 10 Kt Late This Evening, Then Becoming S After Midnight. |
| Wed...Se Wind Around 5 Kt, Veering To Nw In The Afternoon. |
| Wed Night...W Wind 5 To 10 Kt In The Evening, Becoming Light And Variable. |
| Thu...N Wind Around 5 Kt. |
| Thu Night...W Wind 5 To 10 Kt, Becoming S After Midnight. |
| Fri...E Wind Around 5 Kt, Backing To N In The Afternoon. |
| Fri Night...W Wind 5 To 10 Kt, Easing To Around 5 Kt After Midnight. |
| Sat...Nw Wind Around 5 Kt. |
| Sat Night...W Wind 5 To 10 Kt. |
| Sun...Sw Wind Around 5 Kt, Becoming W 10 To 15 Kt In The Afternoon. |
| Sun Night...W Wind 15 To 20 Kt, Rising To 20 To 25 Kt After Midnight. |
| Area Forecast Discussion National Weather Service San Francisco CA 1030am PDT Tuesday Oct 13 2026 Issued at 950am PDT Tuesday Oct 13 2026 Water vapor imagery shows an upper level low digging into the Great Basin this morning, with high pressure over the Pacific. As a result, Northern California remains situated between the two, with dry northerly flow aloft. Given the predominately clear skies, cooler air, and the light winds winds, most locations saw morning temperatures fall into the 40s or lower 50s, with the coldest spots dipping into the 30s. Fall is definitely in the air. That said, as this low shifts east, high pressure will build into the area, with warmer conditions prevailing. Today will be the start of that warming trend, despite the colder start to the day. Expect temperatures to increase a few degrees each day. Overnight temperatures will also see a minor warming trend as well this week, but still expect the cool fall like temperatures through at least Wednesday night. Periods of light to moderate offshore winds will also develop the next several nigheights and continue through the early morning hours across the North and East Bay Mountains and Hills. While these gusty winds will combine with poor to moderate humidity recoveries, the duration and speeds should remain below red flag thresholds. That said, always remember one less spark. Current forecast looks on track, so no updates are planned at this time. Palmer .SHORT TERM... Issued at 1119pm PDT Monday Oct 12 2026 (Tonight through Wednesday) Expect one more cooler taste of fall on Tuesday before a warming trend starts off Wednesday. Upper level troughing will gradually shift eastward Tuesday into Wednesday with upper level ridging building in Wednesday. The marine layer remains mixed out through the short term with clear skies expected across the majority of the area with only patchy clouds expected along the coast. Clear skies will lead to increased radiational cooling and see chillier mornings in the 40s to low 50s returning again Tuesday and Wednesday mornings. Portions of the higher elevations will dip into the 30s but this will be more widespread on Tuesday than on Wednesday as a warming trend begins. Daytime highs on Tuesday will be in the 60s to mid 70s with further warming into the 70s to low 80s across the interior expected on Wednesday as the ridge rebuilds. Coastal temperatures stay fairly consistent in the upper 50s to 60s. Worth noting is the potential for multiple rounds of offshore winds in the overnight to late morning hours starting tonight and continuing through the week. Offshore winds look to be the strongest across the Interior North Bay Mountains and along the Diablo Range in the East Bay and South Bay. The SFO-WMC gradient suggests rounds of overnight offshore winds Monday night and Tuesday night will be light to moderate with the gradient peaking around -3 to -4.5 mb. The gradient is expected to strengthen late week as additional rounds of offshore winds occur (see Long Term discussion). Elevated fire weather conditions are expected across the higher elevations given the moderate pulses of offshore winds, dry conditions, and poor overnight recoveries. Long Term Issued at 1119pm PDT Monday Oct 12 2026 (Wednesday night through next Monday) Temperatures continue to warm Thursday and Friday as upper level ridging builds. High temperatures will peak in the upper 80s to low 90s with pockets of mid to upper 90s across the Santa Cruz Mountains and southern Santa Clara Valley. Patchy Moderate HeatRisk is expected on Thursday with more widespread Moderate HeatRisk across urban areas on Friday. Although not the hottest temperatures we've seen this summer, Moderate HeatRisk makes its return due to overnight lows creeping back into the 50s to low 60s. Not a fan of the heat? Good news, temperatures start to cool again Saturday and Sunday as upper level ridging is disrupted by a cut-off low to our south. This cut-off low will rejoin the jet stream, deepening upper level troughing over the West Coast, and bring cooler weather back to the region. High temperatures drop into the 80s across the interior on Saturday before more fall like weather in the 60s to 70s returns Sunday and Monday. Model guidance indicates there is some potential for light rain (few tenths of an inch) and strong onshore winds early next week as the trough moves through. This will bring a return of hazardous marine conditions and strong winds to mountain gaps and passes and the higher terrain. Elevated fire weather concerns continue across the higher elevations through late this week as additional rounds of offshore flow are expected overnight through the late morning. These pulses of offshore winds look to strengthen overnight Wednesday into Thursday. The GFS (Global Forecast System) shows an initial forecast for the SFO-WMC gradient to reach -9.6 mb late Thursday morning. Offshore flow is likely again Thursday night into Friday morning but it looks to be weaker than the previous night. If you are engaging in any activities involving fire, prevent any flames/sparks from escaping as the fuels are dry and conditions will be favorable for fire to spread. Marine (Today through Sunday) Issued at 950am PDT Tuesday Oct 13 2026 Gentle to fresh northerly breezes will continue through the remainder of the week with an improving seas state through Wednesday. Long period southerly swell will also continue through midweek with some gradual easing by the end of the week. Fire Weather Issued at 118pm PDT Monday Oct 12 2026 There will be a few bursts of offshore winds this week, generally during the overnight hours. The first burst looks to occur tonight, particularly highlight the interior North Bay Mountains, where we could see gusts range from 20-35 mph, perhaps even up to 40 mph for the exposed ridges and the higher elevations. After that, the next area of concern we are monitoring is Wednesday night into Thursday morning, where the pressure gradient should be a bit more tight due to upper level wind patterns. Majority of the area should see offshore flow, in the north to northeast component, with gusts closer to 25-35 mph, locally higher perhaps up to 45 mph for exposed ridges, gaps, and passes. Warm and dry weather will be on tap as well, which will lead to an elevated threat for the higher terrain areas. Another round of offshore winds is expected Thursday night into Friday, but appears to be weaker than the previous two. NOAA San Francisco Bay Area Office: Watches - Warnings - Advisories CA...Coastal Flood Advisory until 3pm PDT this afternoon for CAZ006- 508-529-530. Coastal Flood Advisory until 4pm PDT Wednesday for CAZ506. PZ...None. x.com/nwsbayarea |
San Francisco Radar
Southwest Radar