, Issued at 1229 PM PDT Tue Sep 29 2026 (This evening through Wednesday night)
Isolated patches of stratus and fog linger along the coast, but the region remains generally clear. With the marine layer compressing in response to incoming ridging, any stratus development tonight is limited to the coastal regions, with fog development possible along the coast.
A pattern change is underway as ridging over the eastern Pacific builds into the western United States, with temperatures warming above to significantly above the seasonal averages (5 to 15 degrees warmer) as a result. High temperatures today will be in the middle 80s to the middle 90s for the inland valleys, the middle 70s to the middle 80s near the Bays, and the middle 60s to the lower 70s for the Pacific coast. Wednesday's highs will be similar. A breezy onshore flow should set up each afternoon and evening, while the overnight and morning period will feature a push of offshore flow across the interior mountains of the North and East Bay.
Beginning today and especially Wednesday, areas of Moderate HeatRisk start to pop up across the inland regions. These correspond to a moderate risk of heat-related illnesses for sensitive populations, including children, the elderly, pregnant women, people with chronic illnesses, and people who work or live outdoors without access to adequate cooling or hydration. These areas are not widespread enough to put out a Heat Advisory, but still impact several populated regions, notably the interior valleys of the East Bay and the San Jose region. Follow these tips to avoid heat exhaustion and heatstroke:
* Stay hydrated and drink plenty of fluids. * Wear lightweight, light-colored clothing. * Reduce time spent outdoors or stay in the shade. * Never leave people or pets unattended in vehicles. * Use sunscreen if going to the coast or the pool.
Minor coastal flooding is possible across the bayshore locations of San Francisco Bay, San Pablo Bay, and Monterey Bay around high tide. Up to 1.2 feet of inundation above normally dry land is expected, including up to 0.7 ft of surge caused by thermal expansion and sea level rise since the sea level datum (basically the point where we define as "sea level") was set in the 1983-2001 period. At the San Francisco tidal gauge, high tide is expected to be 1.2 ft above normal (7.01 ft MHHW) at 1:30 PM Tuesday 9/29 and 1.2 ft above normal (7.03 ft MHHW) at 2:10 PM Wednesday 9/30.
..issued at 1229 PM PDT Tue Sep 29 2026 (Thursday through next Monday)
Little change in the sensible weather through the week as a rather resilient ridge sets up across the western United States, supported by the ensemble model cluster analysis and the ensemble model means from the European, American, and Canadian ensemble models. Temperatures may fluctuate a few degrees owing to fluctuations in the upper level pattern, but for the most part, high temperatures through the seven day outlook should be similar to today's highs. The current forecast even suggests a few degrees of warming for the upcoming weekend, with warm spots in the interior valleys reaching the upper 90s and even some isolated triple digits. This is also when we start to see more widespread areas of Moderate HeatRisk, although it's a little early to put out a Heat Advisory. Longer range outlooks suggest that temperatures above seasonal averages will continue into the middle of October.
Minor coastal flooding around high tide continues in low-lying areas across the San Francisco, San Pablo, and Monterey Bay shorelines through Thursday and potentially into Friday. At the San Francisco tidal gauge, high tide is expected to be 1.1 ft above normal (6.92 ft MHHW) at 2:58 PM on Thursday 10/1.
(18z TAFS) Issued at 1033 AM PDT Tue Sep 29 2026
Most terminals were VFR this morning under clear skies, but Monterey Bay region and N Bay Valleys had dense fog leading to LIFR conditions. Since then, VFR have developed and will continue through this afternoon. Gusty onshore winds possible for SFO and OAK this afternoon. For tonight another night of mostly VFR most terminals. However, a shallow/compressed marine layer will allow for periods of LIFR conditions - same locations N Bay and Monterey Bay region. Conf is 30% for dense fog. Conditions may ebb and flow so included dense fog as tempo group.
Vicinity of SFO, VFR. Gusty onshore this afternoon up to 20 kt.
SFO Bridge Approach, Similar to SFO.
Monterey Bay Terminals, VFR this afternoon. Lower CIGs return tonight with LIFR conditions possible tomorrow AM due to dense fog.
(today through Sunday) Issued at 1033 AM PDT Tue Sep 29 2026
Strong high pressure off the California Coast will result in fresh to near gale northerly breezes through Wednesday over the coastal waters. Frequent gale force gusts are expected across the northern waters through Wednesday morning. Conditions will begin to improve Wednesday night as northerly breezes diminish to become gentle to moderate, with locally hazardous conditions across the northern outer waters likely to continue. Rough to very rough seas through Wednesday will subside to become moderate to rough.
Ca, Coastal Flood Advisory until 5 PM PDT Thursday for CAZ006-506- 508-529-530.
PZ, Small Craft Advisory until 3 PM PDT this afternoon for Pt Arena to Pt Reyes 0-10 nm.
Gale Warning until 9 PM PDT this evening for Pt Arena to Pt Reyes 0-10 nm.
Small Craft Advisory until 3 AM PDT Wednesday for Pigeon Pt to Pt Pinos 0-10 nm-Pt Pinos to Pt Piedras Blancas 0-10 nm-Pt Reyes to Pigeon Pt 0-10 nm.
Gale Warning until 9 AM PDT Wednesday for Pt Arena to Pt Reyes 10-60 NM.
Small Craft Advisory until 3 PM PDT Wednesday for Pigeon Pt to Pt Pinos 10-60 NM.
