, 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 MLLW) at 1:30 PM Tuesday 9/29 and 1.2 ft above normal (7.03 ft MLLW) 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 MLLW) at 2:58 PM on Thursday 10/1.
(06z TAFS) Issued at 954 PM PDT Tue Sep 29 2026
Currently VFR except MVFR at HAF. Moderate confidence on LIFR conditions returning to the coastal terminals of HAF, MRY, and SNS with lower confidence in the return at APC and STS, elsewhere VFR. With stratus well offshore, this will likely be achieved via radiational cooling. The best chances are between 08Z and 16Z, more specifically when radiational cooling maximizes around sunrise (14Z). Diurnal winds will prevail. Haze will reduce slant range visibilities.
Vicinity of SFO, Currently VFR with westerly flow. High confidence in VFR and diurnal winds prevailing through the TAF period.
SFO Bridge Approach, Similar to SFO.
Monterey Bay Terminals, Currently VFR with southwesterly flow at MRY and VFR with northerly flow at SNS. Moderate confidence on LIFR conditions returning tonight, best chances are between 08Z and 16Z. Diurnal winds will prevail.
(tonight through next Monday) Issued at 954 PM PDT Tue Sep 29 2026
Hazardous conditions for small craft will continue through Wednesday night across the outer waters and coastal jet regions of Point Reyes and Point Sur. Frequent northerly gale force gusts will continue tonight across the northern outer waters. Conditions will improve Thursday and into the weekend as northerly breezes diminish to become gentle to moderate. Rough to very rough seas Wednesday will subside to become moderate by Friday.
Ca, Coastal Flood Advisory until 5 PM PDT Thursday for CAZ006-506- 508-529-530.
PZ, Small Craft Advisory until 3 AM PDT Thursday for Pigeon Pt to Pt Pinos 10-60 NM-Pt Arena to Pt Reyes 0-10 nm.
Small Craft Advisory until 3 AM PDT Wednesday for Pt Pinos to Pt Piedras Blancas 0-10 nm.
Gale Warning until 9 AM PDT Wednesday for Pt Arena to Pt Reyes 10-60 NM.
