San Francisco Bay South of the Bay Bridge Marine Forecast
| Today...W Wind Around 5 Kt, Rising To 10 To 15 Kt This Afternoon. |
| Tonight...W Wind 5 To 10 Kt, Easing To Around 5 Kt After Midnight. |
| Thu...Sw Wind Around 5 Kt, Veering To W In The Afternoon. |
| Thu Night...W Wind 5 To 10 Kt. |
| Fri...W Wind Around 5 Kt, Rising To 5 To 10 Kt In The Afternoon. |
| Fri Night...W Wind 10 To 15 Kt, Easing To Around 5 Kt After Midnight. |
| Sat...W Wind Around 5 Kt, Rising To 5 To 10 Kt In The Afternoon. |
| Sat Night...W Wind 10 To 15 Kt, Easing To 5 To 10 Kt After Midnight. |
| Sun...W Wind Around 5 Kt, Rising To 5 To 10 Kt In The Afternoon. |
| Sun Night...W Wind 10 To 15 Kt, Easing To Around 5 Kt After Midnight. |
| Area Forecast Discussion ...UPDATED National Weather Service San Francisco CA 930am PDT Wednesday Jun 10 2026 ...New .KEY MESSAGES... Updated at 1201am PDT Wednesday Jun 10 2026 - Warm and dry weather expected today through Saturday with a moderate risk of heat-related illnesses for interior locations today and Thursday - Increased risk of sneaker waves and strong rip currents along south and southwest facing beaches through Thursday morning - Critical fire weather concerns for the interior North Bay and the East Bay Mountains late tonight into Thursday morning - Minor coastal flooding near high tide beginning this evening for low-lying Bayshore locations Issued at 925am PDT Wednesday Jun 10 2026 The short term forecast is in good shape, so no changes anticipated. Shallow morning fog (dense in spots) along some of the immediate coastal regions continues to dissipate and in the next 1-2 hours, I anticipate mostly sunny conditions. Our fire, heat, and coastal headlines all appear on track. We're anticipating Red Flag conditions at elevation across the North Bay Interior Mountains and East Bay Hills starting tonight into the pre-dawn hours on Thursday. The main highligheights are enhanced wind gusts due to building high pressure in the wake of a diffuse trough moving to the north and east of the region. Latest NWP (Numerical Weather Prediction) has suggested a slight decrease in the MSLP/height gradient (thereby leading to a more subdued jet across the Sacramento Valley). Wind gusts in excess of 40 mph with gusts as great as 60 mph at the higher peaks are still anticipated. Fuels will continue to cure and overnight RH recovery of less than 30% will translate to a potential for fire ignitions and spread, especially with favorable alignment. Winds will abate through the day on Thursday, however, afternoon humidity values will remain critically dry with values in the teens. Remember to obey any local fire restrictions/burn bans and avoid activities that could spark wildfires. Remember, one less spark, one less wildfire! Regarding heat products, today will be warm, with more impactful heat anticipated on Thursday as offshore winds limit marine layer development (except along the immediate coastline). Be sure to hydrate with plenty of water, limit strenuous outdoor activities to the early morning or evening hours, and never leave children or pets unattended in vehicles. We'll continue to examine the need for additional heat headlines across far interior regions (East Bay) on Friday as onshore flow may initially be very modest. Finally, coastal hazards are in effect due to an increased risk for sneaker waves/rip currents. If headed to the beach to seek relief from the heat or for recreation, be sure to check conditions before you venture out. Keep an eye on children and pets and never turn your back on the ocean. Minor coastal flood impacts are anticipated due to astronomical tides. While higher than normal high tides are anticipated to occur mostly during the overnight period later this week and into the weekend, coastal infrastructure may experience minor, but impactful, inundation. .SHORT TERM... Issued at 1201am PDT Wednesday Jun 10 2026 (Today and tonight) Clear conditions will generally prevail through the night as a ridge over the eastern Pacific moves into the region, kicking off the first of several days of warm to hot temperatures across the region. High temperatures today range from the upper 80s to the middle 90s across the inland valleys, with the warmest spots reaching the triple digits, while areas near the Bays see highs in the middle 70s to middle 80s, perhaps the lower 70s near southern Monterey Bay, and the coastal regions see highs in the 60s. The interior regions will see Moderate HeatRisk develop, meaning that there is a risk for heat related illnesses among heat sensitive populations, including children, the elderly, pregnant women, people with chronic health conditions, and people who work or live outdoors without adequate shelter, cooling, or hydration. There will be some relief tonight through Thursday morning as the valleys cool to the middle 50s to lower 60s, while those in the thermal belts will see low temperatures hover in the middle 60s to lower 70s. This is also when strong north to northeast winds will develop in the interior mountains of the Bay Area, especially across the North and East Bays where peak wind gusts of 35 to 45 mph are expected across the area with gusts of 60 mph or higher possible in the ridgetops. These offshore winds will contribute to poor humidity recoveries across the area overnight, and the combination of the hot, dry, and windy conditions will result in critical fire weather conditions where any fires that start could take hold and spread rapidly. A Red Flag Warning has been issued for the North and East Bay interior mountains, to come into effect tonight at 11pm and lasting through 9am Thursday. Fire weather concerns are also elevated across the eastern mountains of Santa Clara County, although the wind gusts will not be as strong. See the FIRE WEATHER section for more information. High astronomical tides, combined with around half a foot of surge driven by southerly swell and thermal expansion, will result in minor flooding in low-lying areas near the Bayshore beginning this evening, mainly around low-lying locations in the North Bay and particularly eastern Marin County, and expanding to cover the rest of the San Francisco Bayshore beginning Thursday evening. Coastal Flood Advisories will go into effect at 6pm tonight for the North Bay, and on 7pm Thursday for the rest of the San Francisco Bayshore. At the San Francisco tidal gauge, high tide is expected to be 0.6 ft above normal (6.58 ft MLLW) at 811pm on Wednesday the 10th, 1.2 ft above normal (6.98 ft MLLW) at 851pm on Thursday the 11th, and 1.5 ft above normal (7.23 ft MLLW) at 934pm on Friday the 12th. The astronomical tide predictions will support an extension of the Coastal Flood Advisories through the weekend and into the early part of next week. As a final note, long-period southerly swell is causing an increased risk for potentially dangerous sneaker waves and rip currents. A Beach Hazards Statement is in effect for parts of the Pacific Coast. See theBeaches ction for more information. Long Term Issued at 1201am PDT Wednesday Jun 10 2026 (Thursday through Tuesday) Thursday should be the warmest day of the week as the ridge persists across the region. Temperatures in the inland valleys will jump into the 90s to near 102, with the warmest spots going up to around 105, while the Bays see highs ranging from the 80s to the middle 90s and the coastal communities range in the middle 60s to lower 80s. A Heat Advisory will come into effect from noon to 11pm on Thursday for the North Bay valleys and interior mountains, the Sonoma coastal range, the East bay, the Santa Clara valley and eastern mountains, and the San Francisco Bay shoreline. The current forecast shows a gradual slight cooling trend beginning on Friday, which is a little curious given the lack of an obvious large scale change to the upper level pattern. Once again, I've opted to bump up the temperatures slightly on Friday owing to the model diagnosis, but there are models that are trying to put marine layer influence back into the region, although how far it goes depends critically on what it can do against the high pressure system. By Saturday, an shortwave trough tries to form over northern California, which could bring us another burst of offshore flow. Considered bumping temperatures up on Saturday as well, but my confidence isn't high enough to pull the trigger as of yet. Ensemble model cluster analysis converges on the ridge continuing to impact the state for the early part of next week as the ridge axis builds into the Pacific Northwest into southwestern Canada. Beyond that, they hint at the ridge breaking down in the middle of next week, although whether that will manifest as weaker ridging over the western US or more zonal flow is to be determined. Marine (Today through Monday) Issued at 403am PDT Wednesday Jun 10 2026 Gale force gusts will continue across the northern waters, with gusty northwest winds continuing across the rest of the waters, resulting in hazardous conditions for small craft. Winds and seas begin to ease by Thursday evening and are expected to stay light through the remainder of the forecast period. Fire Weather Issued at 750pm PDT Tuesday Jun 9 2026 Hot temperatures, gusty north winds, and low humidities across the North Bay interior mountains into the Diablo Range will raise the fire weather threats late on Wednesday into Thursday, with a particular emphasis on the interior mountains of Napa County. Red Flag Warnings have been issued for the interior mountains of the North and East Bay from 11pm Wednesday night through 9am Thursday morning as the greatest risk of rapid fire spread arrives. Although the strongest winds will remain within the Sacramento Valley, gusts of 30 to 40 mph are expected to spread into Napa County and the Diablo Range south through Santa Clara County, with stronger gusts of 50-60 mph possible along the Vaca Mountains along Napa County's eastern edge. Meanwhile, daytime humidity retention will be very poor with relative humidity values as low as 10-15%, while overnight recoveries are likewise poor as RH values top out at 20-30%. Thus, fuels are expected to dry rapidly, leading to the elevated fire weather concerns. Also important to note that even with the drizzle and light rain coming through the region, wetting rains (rain totals above 0.1") are not expected, limiting any relief that will be realized for the midweek period. Elsewhere across the district, conditions remain hot and dry, but we're not expecting winds to be as strong as they are across the interior North Bay. Remember, one less spark, one less wildfire. DialH Beaches Issued at 750pm PDT Tuesday Jun 9 2026 Long period southerly swell is moving through the waters with buoy observations suggesting that a swell of around 4 to 6 feet is coming from 190 degrees, just west of due south, with a period of around 19 to 21 seconds. The long period swell will result in an increased risk of sneaker waves and strong rip currents along south and southwest facing beaches. As a result, a Beach Hazards Statement has been issued for the Pacific Coast of the North Bay, San Mateo, and Santa Cruz counties through 5am on Thursday. Sneaker waves will run up the beach much farther than other waves, potentially catching beachgoers by surprise and resulting in people being swept into the water. Rip currents are strong enough to pull the strongest swimmers away from shore. Swim near a lifeguard if possible. Stay back from the beach, and away from jetties, piers, beachside rocks, and other infrastructure near the water. Never turn your back to the ocean! DialH Climate Issued at 1235am PDT Wednesday Jun 10 2026 The following are the record highs for June 11th. Station Record Highs June 11th Santa Rosa 100 in 2019 San Rafael 97 in 1985 Napa 102 in 2019 Livermore 105 in 1985 San Francisco 92 in 2019, 1877 SFO Airport 98 in 2019 Redwood City 102 in 2019 Oakland Museum 99 in 2019 Half Moon Bay 85 in 2019 San Jose 99 in 2019 Monterey Airport 92 in 2019 Salinas Airport 104 in 2019 NOAA San Francisco Bay Area Office: Watches - Warnings - Advisories CA...Coastal Flood Advisory from 7pm Thursday to 1am PDT Saturday for CAZ006-508. Heat Advisory from noon to 11pm PDT Thursday for CAZ503-504-506- 508-510-513>515. Red Flag Warning from 11pm this evening to 9am PDT Thursday for CAZ504-515. Beach Hazards Statement through late tonight for CAZ505-509-529. Coastal Flood Advisory from 6pm this evening to 1am PDT Saturday for CAZ506. PZ...Small Craft Advisory until 9pm PDT this evening for Mry Bay. Small Craft Advisory until 9am PDT this morning for Pt Arena to Pt Reyes 0-10 nm. Gale Warning until 9pm PDT this evening for Pt Arena to Pt Reyes 0-10 nm. Small Craft Advisory until 9pm PDT this evening for Pigeon Pt to Pt Pinos 0-10 nm-Pt Reyes to Pigeon Pt 0-10 nm. Small Craft Advisory until 3am PDT Thursday for Pt Pinos to Pt Piedras Blancas 0-10 nm. Gale Warning until 3pm PDT Thursday for Pt Arena to Pt Reyes 10- 60 NM. Small Craft Advisory until 9am PDT Thursday for Pigeon Pt to Pt Pinos 10-60 NM. x.com/nwsbayarea. |
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