Swell Matrix

Area Forecast Discussion

National Weather Service San Francisco CA

419 am PDT Sun apr 26 2026

Short Term

, Issued at 1031 PM PDT Sat Apr 25 2026 (Tonight through Monday)

Most of the radar returns for rain have moved into the Central Valley, but some of the rain gauges are picking up a few hundredths of rain. This will likely be the theme for much of the night in the Bay Area and Central Coast: light rain and drizzle, barely showing up on radar. Shorter-term, high-res models agree on waves of light rain through the night with moments of drizzle possible in between.

Rain chances reduce slightly into Sunday, but coastal drizzle and pockets of light rain will be possible with overcast skies.

This added moisture and lack of sunshine will make Sunday the coolest day of the forecast, with most populated area just barely breaking into the 60s and some of the interior mountains staying in the 40s.

Sunday night into Monday sees a slight increase in light rain and drizzle chances, but these chances look to erode and exit into late Monday morning. Overall accumulations from the weekend precipitation will stay on the light and non-impactful side. Cloud cover lingers through much of Monday, and along with good onshore flow, temperatures will stay on the cooler side. Highs on Monday look to be only a few degrees warmer than Sunday, and may arrive later in the day as cloud cover tries to thin before sunset.

Long Term

..issued at 1031 PM PDT Sat Apr 25 2026 (Monday night through next Saturday)

Skies look to clear in the early night on Monday, but some marine stratus looks to form into Tuesday morning, supported by a modest marine layer.

From there, the overall pattern gets into an interesting mix. Ridging to the north, with a cutoff low to the south will lead to an active wind environment out to sea, but will greatly vary the weather overland. Coastal and slightly inland areas will see modest increases in temperature, but the reforming marine layer will provide cloud cover and more moisture in the air, preventing too much of a warm up. Areas outside of the marine layer will see more of the affects from the ridge, leading to much more notable warming. Highs look to climb into the 80s for the interior areas by the mid to late week, while the coast looks to peak in the 60s and the slightly inland areas build into the low 70s.

Longer term models hint at another trough digging into California coast next weekend. The increased onshore flow and cloud cover will call for cool conditions once again, along with some light rain. These chances for rain could be on the fragile side since the model guidance looks ..odd.. in the Pacific jetstream pattern. However, as odd-looking as the pattern looks, models are in ..oddly.. good agreement in the 200+ hour forecast. This'll be something to keep an eye on as the forecast develops, but maybe we're not done with rain just yet!

Aviation

(12z TAFS) Issued at 419 AM PDT Sun Apr 26 2026

Generally MVFR-low end VFR conditions prevail across the region, and will persist through the TAF period although ceilings are expected to lift slightly through the post-sunrise hours. Light showers will continue to move through the region through the morning, with low confidence of showers returning to the region this evening, but these showers should remain non-convective and not result in major impacts to the flight conditions. Breezy westerly winds will develop in the afternoon, diminishing overnight.

Vicinity of SFO, MVFR-low end VFR conditions through the TAF period. Winds will pick up from the west this afternoon before diminishing overnight. A low confidence and probability for showers will develop this evening into early Monday morning.

SFO Bridge Approach, Similar to SFO.

Monterey Bay Terminals, MVFR-low end VFR conditions through the TAF period with westerly winds picking up in the afternoon. Showers will persist through the morning, with the chances dipping in the late afternoon and evening before a low confidence forecast for their return tonight through early Monday morning.

Marine

(today through Friday) Issued at 419 AM PDT Sun Apr 26 2026

Moderate west to northwest breezes persist through the middle of next week before increasing to a fresh to strong northwest breeze. These stronger winds will build rough seas of 8-12 feet in exposed waters into the following weekend.

Watches, Warnings, Advisories

Ca, None. PZ, None.

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