, Issued at 111 PM PDT Sat Oct 3 2026 (This evening through Sunday night)
The morning started off with stratus and reduced visibilities starting along the San Francisco coast to the Big Sur Coast. Unfortunately, this was short lived as clouds and fog mixed out right around sunrise, leading to sunny skies for much of the morning. Temperatures have responded accordingly, exceeding their initial forecast earlier this morning. Attempted to adjust them with the late morning forecast package update, but even then some sites will likely exceed their forecast highs. Looking to tomorrow, the forecast should be similar if not hotter meaning temperatures may need to be bumped for coastal locations. For now, opted to keep the Heat Advisory that was issued for Sunday the same and not include the southern portion of the Monterey Bay. However, should temperatures continue to exceed their forecast amount, they may need to be added tomorrow.
All that to be said, we're in the beginning of the heat wave and Moderate to Major HeatRisk is expected for Sunday. Make sure to beat the heat by practicing heat safety. You can visit weather.gov/safety for more information, but here a few quick handy tips.
* 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.
..issued at 111 PM PDT Sat Oct 3 2026 (Monday through next Friday)
The heat continues into the upcoming work week and with confidence increasing in where it'll happen, the Heat Advisory for the interior Bay Area and interior Central Coast has been extended until 10PM Wednesday. Additional areas may need to be added to it, with the highest confidence being for the northern Monterey Bay region. Elsewhere, like San Francisco, Marin, and the southern Monterey Bay, confidence remains moderate to low thus we opted to hold out on extending or adding these beyond Sunday. Nonetheless, it'll be hot, so please continue to take precautions and practice heat safety to avoid heat exhaustion and heat stroke.
Looking at the end of the week, around Friday and into next weekend, ensembles continue to trend towards cooler weather. The current forecast, if we don't stay in a ridging pattern, has much of the region in Minor HeatRisk. Highs continue to trend in the mid 60s to low 70s along the coast, the upper 70s to mid 90s for interior valley locations, and the 80s to mid 90s for higher elevations. Ensembles and guidance show either zonal flow or the beginning of troughing starting to form. Timing and placement is still a bit iffy as to when any sort of trough makes it here, but it's something we'll keep an eye.
(06z TAFS) Issued at 932 PM PDT Sat Oct 3 2026
The 00Z weather balloon found no trace of a marine layer at Oakland. With high pressure, warm temperatures and weak offshore winds VFR conditions are highly likely at all but the most coastal terminals through the TAF period. MRY and HAF are the exceptions, where there is a decent chance for brief LIFR conditions due to fog around sunrise. Even if that happens, it will clear quickly with VFR conditions and high clouds expected across the terminals Sunday.
Vicinity of SFO, Westerly winds are calming down, with a gentle breeze expected through the night. There is a 90% chance that VFR conditions persist through the TAF period. W-NW winds will reach 10-15 knots Sunday afternoon as high clouds roll in.
SFO Bridge Approach, Similar to SFO.
Monterey Bay Terminals, Pretty interesting forecast for MRY. There is a 9C dew point depression at the moment, but it was 14C less than an hour ago. With moderate onshore winds, there is finally some marine influence being felt at the terminal. With high pressure aloft, clear skies and light winds Sunday morning, all the ingredients are there for fog in the morning. At the Monterey buoy, the dew point matches the warm sea surface temperature (16C) and the air temperature is only slightly warmer (16.2C). That's a pretty ideal set-up for fog formation, but it hasn't formed in the Bay yet.
(tonight through next Friday) Issued at 932 PM PDT Sat Oct 3 2026
A gentle to moderate NW breeze and moderate wave heights will prevail for the next several days.
Ca, Heat Advisory until 10 PM PDT Sunday for CAZ006-502-505-509- 528>530.
Heat Advisory until 10 PM PDT Wednesday for CAZ503-504-506-508- 510-512>518.
PZ, None.
