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San Geronimo Weather Forecast
| REST OF TONIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | LABOR DAY | TUESDAY | TUESDAY NIGHT | WEDNESDAY |
 |  |  |  |  | | | | | | |  |
| Chance of Rain | Rain | Partly Cloudy | Sunny | Mostly Clear | Sunny | Mostly Clear | Mostly Clear | Mostly Clear | Mostly Clear | Partly Cloudy | Partly Cloudy |
| Lo: 55°FLo: 13°C | Hi: 69°FHi: 21°C | Lo: 51°FLo: 11°C | Hi: 71°FHi: 22°C | Lo: 51°FLo: 11°C | Hi: 75°FHi: 24°C | Hi: 71°FHi: 22°C Lo: 51°FLo: 11°C | Hi: 71°FHi: 22°C Lo: 51°FLo: 11°C | Hi: 81°FHi: 27°C Lo: 59°FLo: 15°C | Hi: 81°FHi: 27°C Lo: 59°FLo: 15°C | Hi: 81°FHi: 27°C Lo: 59°FLo: 15°C | Hi: 81°FHi: 27°C Lo: 59°FLo: 15°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 902 PM PDT Wed Sep 02 2026 
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Issued: 854 PM PDT Wed Sep 2 2026
Key Messages
Updated at 1159 AM PDT Wed Sep 2 2026- Well below normal temperatures with beneficial, light rain chances through Thursday
- Gradual warming and drying trend with the return of the marine layer Friday into the weekend
Aviation
... (00Z TAFS) Issued at 603 PM PDT Wed Sep 2 2026
The main forecast concern will be the passage of the cold front late tonight into Thursday morning. Hi-res guidance has the front arriving in the North Bay around 6-8Z and the gradually moving south. The highest chan...