, Issued at 107 PM PDT Tue Sep 1 2026 (This evening through Wednesday night)
Mostly clear sky conditions have returned to the Central Coast with scattered low clouds across the Bay Area and North Bay. There are also high clouds associated with an approaching frontal boundary across the North Bay. As such, temperatures today will be 5-15 degrees below normal as the 850 mb temperature drops below 10C/50F for the first time since May. Additionally, there is a chance for for light rain and/or drizzle across the North Bay tonight into Wednesday morning with pre-fronatal coastal drizzle for areas to the south.
Low clouds will spread back inland overnight and into Wednesday morning with temperatures generally the 50s across much of the region and in the 40s in the higher elevations. Similar conditions are forecast for Wednesday with another disturbance moving in from the northwest Wednesday night into Thursday. This will bring increasing potential for light rain across the North Bay and portions of the Bay Area. The greatest potential to see greater than 0.25" will be in the coastal ranges of the North Bay and 0.10" in and around Santa Rosa and the Sonoma County valleys by Thursday morning. Rainfall amounts drastically drop off the further south you go.
..issued at 107 PM PDT Tue Sep 1 2026 (Thursday through next Monday)
Heading into this upcoming weekend, there is the potential we see a slight warming trend high pressure over the central United States builds westward. However, troughing off of the West Coast will main cooler than average temperatures throughout the weekend.
Ensemble clusters diverge heading into next week. As such, still keeping an eye on tropical development over the eastern Pacific Ocean for any northward movement of tropical moisture. However, the latest guidance is indicating the track of TS Marie should stay well to our south, potentially bringing impacts to southern California. For more information on tropical developments visit nhc.noaa.gov.
(18z TAFS) Issued at 1006 AM PDT Tue Sep 1 2026
VFR conditions are expected to prevail through the forecast period for all terminals. A deepening trough will continue to mix out lingering low level clouds by early afternoon.
Vicinity of SFO, VFR with occasionally breezy onshore flow this afternoon and early evening.
SFO Bridge Approach, Similar to SFO.
Monterey Bay Terminals, VFR is expected to prevail through the forecast period with a slight chance of MVFR ceilings developing after midnight.
(today through Sunday) Issued at 915 AM PDT Tue Sep 1 2026
Light northwesterly breezes will persist through the week with occasional moderate breezes. Slight to moderate wind driven seas will continue through the week with tropical cyclone activity producing long period southerly swell by the end of the week into the weekend.
Ca, None. PZ, None.
