, Issued at 1214 PM PDT Sun Sep 27 2026 (This evening through Monday night)
High clouds continue to float over the Bay Area and Central Coast, while stratus coverage lingers across coastal Marin and San Mateo counties, the Oakland area, the city of San Francisco, and the southern Monterey Bay region. Some mixing out is possible through the afternoon where the high clouds clear out, but some coastal regions may remain socked in through the day. Stratus should return inland this evening and overnight.
Water vapor imagery shows a deep trough, perhaps even a cut-off low, centered just off of Cape Mendocino, which brings in cooler air to the region. Highs today will range in the 70s for the inland valleys, into the lower to middle 80s for the warmest spots of southern Monterey County, and the upper 50s to the lower 70s for the coastal and Bayshore regions. Breezy onshore winds will develop in the afternoon and evening with gusts of 20 to 30 mph at the coast, through favored gaps and passes, and within the Salinas Valley.
As the trough/low moves across the state, and ridging comes in behind it, the upper level winds over the Bay Area and Central Coast will shift from southwesterly to northeasterly, leading to a push of offshore flow on Monday morning. The strongest winds look to develop on the lee sides (southwest-facing slopes) of the interior mountains of the North Bay, where hydraulic jump effects will push wind gusts to around 20 mph. High temperatures will warm a fair bit in the inland valleys, where the forecast calls for middle 70s to middle 80s, and the Bayside locations, which should expect highs in the upper 60s to middle 70s.
..issued at 1214 PM PDT Sun Sep 27 2026 (Tuesday through next Saturday)
Additional pushes of higher elevation offshore flow will set up on Tuesday morning and Wednesday morning, chiefly across the North and East Bay interior mountains. The strongest push looks to be on Tuesday morning with wind gusts of 25 to 35 mph possible in the interior mountains of the North Bay. The potential for wind gusts above 35 mph is greatest at the ridgeline of the Vaca Mountains along the eastern border of Napa County.
Otherwise, seasonably warm temperatures should be fully established by Tuesday as highs in the inland valleys reach the middle 80s to the middle 90s, those in the Bayshore regions reach the middle 70s to the middle 80s, and the Pacific coast reaches the middle 60s to middle 70s. Temperatures may fluctuate by a few degrees each day but the general trend should remain similar through the end of the seven day outlook. Some areas of Moderate HeatRisk, a level of heat that brings a moderate risk of heat- related illnesses to sensitive populations, will develop through the next few days, but confidence in widespread impacts is not high enough to issue a Heat Advisory at this point. Longer-range guidance suggests that temperatures above the seasonal average will continue into the middle of October.
As a final point, minor coastal flooding is possible in low-lying areas across the San Francisco, San Pablo, and Monterey Bay shorelines Tuesday through Thursday. Up to 1.1 feet of inundation above normally dry land is expected, including up to 0.6 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 1983-2011 period. At the San Francisco tidal gauge, high tide is expected to be 1.0 ft above normal (6.81 ft MLLW) at 1:30 PM Tuesday 9/29, 1.1 ft above normal (6.93 ft MLLW) at 2:10 PM Wednesday 9/30, and 1.0 ft above normal (6.82 ft MLLW) at 2:58 PM on Thursday 10/1.
(18z TAFS) Issued at 1128 AM PDT Sun Sep 27 2026
High clouds continue to stream in across the region revealing an dissipating marine layer beneath. While stratus persist along the coast, inland locations are rapidly scattering out. An approaching trough will deepen the marine layer tonight into Monday with a return of low clouds expected once again tonight into Monday morning.
Vicinity of SFO, MVFR conditions will quickly scatter out making way for VFR conditions with scattered high clouds. Moderate confidence that MVFR cigs will return overnight between 06z-09z. Light to moderate onshore flow will prevail through midday with moderate and gusty winds expected this afternoon for KSFO. Clearing is anticipated around 17z Monday morning.
SFO Bridge Approach, Similar to SFO.
Monterey Bay Terminals, MVFR conditions will quickly scatter out making way for VFR conditions with scattered high clouds. Moderate to high confidence that MVFR cigs will return this evening around 02z. Light to locally moderate onshore flow is prevail.
(today through Friday) Issued at 902 AM PDT Sun Sep 27 2026
Moderate north winds will persist today, becoming moderate to strong as we head into Monday. Strongest winds will be over northern outer water and south of Point Pinos with near gale force gusts expected at times. Winds hold through midweek then taper becoming light to moderate by the end of the work week. Tropical activity will produce long period southerly swell by the middle of the week.
Ca, None. PZ, Small Craft Advisory until 3 AM PDT Monday for Mry Bay-Pigeon Pt to Pt Pinos 0-10 nm-Pt Arena to Pt Reyes 0-10 nm.
Small Craft Advisory until 2 AM PDT Tuesday for Pt Arena to Pt Reyes 10-60 NM-Pt Pinos to Pt Piedras Blancas 0-10 nm.
Small Craft Advisory from 9 PM this evening to 9 AM PDT Monday for Pigeon Pt to Pt Pinos 10-60 NM.
