Swell Matrix

Area Forecast Discussion

National Weather Service San Francisco CA

1000 am PST Fri Feb 20 2026

Short Term

, Issued at 303 AM PST Fri Feb 20 2026 (Today and tonight)

Isolated rain showers continue across the marine zones and Central Coast with the help of surface troughing. These rain showers will be unimpactful and are expected to wane by sunrise. It is going to be a cold start to the morning, so be sure to grab some extra layers on your way out the door! The 00Z sounding observed an 850 millibar temperature of -1.75 degrees Celsius which is below the tenth percentile (-0.5 degrees Celsius) for the date and time. While it is going to be cold, we are not expecting any records to be tied or broken. Probably of more interest (and relief) in the short term is that it is going to be dry as high pressure noses in from the Eastern Pacific Ocean. Maximum temperatures will warm to 10 degrees below normal today with another cold night on tap. Precautions should be taken to protect people, pets, and plants.

Long Term

..issued at 303 AM PST Fri Feb 20 2026 (Saturday through Thursday)

Unsettled weather will return this weekend as the region gets skirted by a couple passing low pressure systems in the Pacific Northwest. Light rain showers will return to the North Bay Saturday morning with drizzle possible for locations farther south. More impactful will be the wind with southerly gusts up to 45 mph possible along the coast and in the higher terrain. Probabilities are low to moderate (less than 50% chance) and are across a small area, thus a Wind Advisory is not warranted at this time. The weekend will be your best bet to clean up any damage that occurred this week and prepare for next week's weather. Global ensemble clusters are in agreement of upper-level ridging across the Intermountain West and upper-level troughing off the Pacific Northwest Coast with heights rising at least through Monday. Another developing surface low pressure system off the Pacific Northwest will source moisture from the tropics with ECMWF and GEFS IVT ensemble mean peaking near 500 kg/ms by Tuesday. Southwesterly flow (from the tropics) will allow for efficient rainfall due to the fetch of moist, warm air. As a result, southwest facing terrain will have the highest accumulation with the help of orographic lift with the lee side valleys experiencing the rain shadow effect. Fortunately, the trend has been our friend with all of the above systems trending farther north between forecasts which will allow for a reprieve between the deluge that we have experienced the past week. As the forecast looks right now, the Monday into Tuesday system will bring widespread rainfall. Minor flooding of low-lying, poor drainage, and urban areas will be possible with ponding and slick roadways a guarantee. Mainstem river flooding is not expected with a low probability (less than 20%) of occurrence.

Aviation

(18z TAFS) Issued at 958 AM PST Fri Feb 20 2026

High confidence for VFR conditions to prevail through the TAF period. Passing high clouds will persist through 00Z Saturday with them returning by around 09Z Saturday. Lower cloud cover (still VFR) is forecast to return late in the night across the North Bay and then spread southward throughout the day on Saturday.

Vicinity of SFO, VFR. Weak offshore flow will prevail this morning with northwesterly flow possible at times early this afternoon. However, wind speeds are forecast to be generally less than 6kt. Southerly winds are forecast to increase after 18Z Saturday ahead of an approaching system.

SFO Bridge Approach, Similar to SFO.

Monterey Bay Terminals, VFR. North to northwesterly winds are forecast to develop early this afternoon and prevail through around sunset. Light and variable winds are forecast until becoming southerly around 03Z Saturday and increasing into Saturday morning ahead of an approaching system.

Marine

(today through Wednesday) Issued at 958 AM PST Fri Feb 20 2026

Winds will shift to southerly and increase over the weekend, the strongest winds across the northern waters with gale force gusts by Saturday afternoon. As a result, rough to very rough seas redevelop by late weekend into early next week. Rain chances return late Saturday and continue into early to mid next week.

Watches, Warnings, Advisories

Ca, None. PZ, Small Craft Advisory from 3 PM to 9 PM PST Saturday for Mry Bay.

Small Craft Advisory from 3 AM to 3 PM PST Saturday for Pt Arena to Pt Reyes 0-10 nm-Pt Reyes to Pigeon Pt 0-10 nm.

Gale Warning from 3 PM to 9 PM PST Saturday for Pigeon Pt to Pt Pinos 0-10 nm-Pigeon Pt to Pt Pinos 10-60 NM-Pt Arena to Pt Reyes 0-10 nm-Pt Pinos to Pt Piedras Blancas 0-10 nm-Pt Reyes to Pigeon Pt 0-10 nm.

Small Craft Advisory from 9 AM to 3 PM PST Saturday for Pigeon Pt to Pt Pinos 0-10 nm-Pigeon Pt to Pt Pinos 10-60 NM-Pt Pinos to Pt Piedras Blancas 0-10 nm.

Small Craft Advisory from 9 PM this evening to 3 AM PST Saturday for Pt Arena to Pt Reyes 10-60 NM.

Gale Warning from 3 AM to 9 PM PST Saturday for Pt Arena to Pt Reyes 10-60 NM.

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