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San Quentin Weather Forecast
| REST OF TODAY | TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT |
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| Sunny | Patchy Fog | Patchy Fog | Patchy Fog | Patchy Fog | Patchy Fog | Patchy Fog | Fog | Partly Cloudy | Patchy Fog | Partly Cloudy | Patchy Fog |
| Hi: 81°FHi: 27°C | Lo: 55°FLo: 13°C | Hi: 76°FHi: 24°C | Lo: 59°FLo: 15°C | Hi: 75°FHi: 24°C | Lo: 55°FLo: 13°C | Hi: 75°FHi: 24°C | Lo: 55°FLo: 13°C | Hi: 76°FHi: 24°C | Lo: 55°FLo: 13°C | Hi: 87°FHi: 31°C | Lo: 55°FLo: 13°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 302 PM PDT Mon Sep 14 2026 
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Issued: 1209 PM PDT Mon Sep 14 2026
Key Messages
Updated at 1206 PM PDT Mon Sep 14 2026- Cooling trend and below normal temperatures through mid-week; return to seasonal temperatures late week into weekend
Aviation
... (18Z TAFS) Issued at 1004 AM PDT Mon Sep 14 2026
VFR at all terminals this morning with onshore winds forecast to increase through the afternoon before easing after sunset. However, the forecast wind speeds will be less than previous days. Moderate confidence for the return of stratus over the Bay Area terminals tonight ...