Swell Matrix

Area Forecast Discussion

National Weather Service San Francisco CA

1220 pm PDT Sun jul 5 2026

Short Term

, Issued at 1218 PM PDT Sun Jul 5 2026 (This evening through Monday night)

Coastal stratus continues to retreat to the coast early this afternoon with mid-to-high level clouds also exiting to the east. Temperatures this afternoon are forecast to range from the upper 50s to lower 60s along the immediate coastline, middle 60s to middle 70s near the bays, middle 60s to lower 80s in the inland valleys, and upper 60s to lower 90s in the warmest interior spots. These temperatures are generally up to 10 degrees below seasonal averages as a shortwave through continues to impact the region. Breezy onshore winds are also forecast to develop this afternoon with gusts up to 20 to 25 mph through gaps, passes, and the Salinas Valley.

Once again, stratus will return to the coast late this afternoon/early evening and return into the inland valleys overnight through Monday morning before retreating back to the coast by Monday afternoon. Troughing aloft will maintain cooler conditions once again on Monday with similar afternoon temperatures as today. A few passing high clouds are also likely. Similar stratus pattern is expected once again Monday night into Tuesday morning.

Long Term

..issued at 1218 PM PDT Sun Jul 5 2026 (Tuesday through next Saturday)

A gradual warming trend will persist through the second half of the week as high pressure strengthens over the Desert Southwest. However, persistent onshore flow will maintain a modest marine layer and keep conditions near the coast cooler than inland areas. Overall, HeatRisk look to remain in the Minor category with isolated pockets of Moderate in the warmest interior locations.

Aviation

(18z TAFS) Issued at 1131 AM PDT Sun Jul 5 2026

Lingering MVFR stratus is currently scattering out of the remaining terminals. VFR conditions prevail through the day with gentle to moderate winds (around 12-16kt) across our region. North Bay terminals will experience south to southwest winds. Terminals south of the Golden Gate will experience west to northwest winds. Low confidence for clearing at KHAF for a prolonged period of time. Any scattering that develops at KHAF may be short-lived with MVFR conditions prevailing through the majority of the day. The marine layer returns this evening with a pattern similar to the previous night. Anticipate borderline MVFR-IFR ceilings after 02-03Z Monday. Ceilings in the interior East and South Bay valleys develop after 09Z Monday. High confidence that KSTS will drop down to LIFR conditions. LIFR ceilings are also probable for KHAF, though confidence is too low to include in the TAF. Conditions improve to VFR beginning 17Z Monday.

Vicinity of SFO, Moderate northwest breezes around 16 kt prevail through the afternoon and diminish to a gentle westerly breeze (~8kt) overnight. Medium confidence on timing of stratus tonight as it may develop an hour or two later.

SFO Bridge Approach, Similar to SFO. MVFR ceilings may develop a few hours after SFO around 10-11Z Monday and persist through 16-17Z.

Monterey Bay Terminals, VFR with northwest winds around 10-12kt developing this afternoon until the stratus deck rolls in at 02Z Monday. High confidence that IFR ceilings are expected to impact both SNS and MRY again this evening and persist through 17Z Monday. Northwest winds remain gentle (~5 kt) overnight.

Marine

(today through Friday) Issued at 904 AM PDT Sun Jul 5 2026

A weak cold front to the north will lead to decreasing northerly flow over the coastal waters through Monday. Winds are forecast to increase by Monday night with fresh to strong breezes expected Tuesday and through much of the week. Some gusts near gale or gale force are possible by Thursday.

Watches, Warnings, Advisories

Ca, None. PZ, None.

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