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San Mateo County Weather Forecast
| TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | LABOR DAY |
 |  |  |  |  |  | | |  | | | |
| Partly Cloudy | Mostly Cloudy | Patchy Fog | Chance of Rain | Chance of Rain | Partly Cloudy | Patchy Fog | Patchy Fog | Mostly Clear | Mostly Cloudy | Mostly Clear | Partly Cloudy |
| Lo: 59°FLo: 15°C | Hi: 75°FHi: 24°C | Lo: 59°FLo: 15°C | Hi: 70°FHi: 21°C | Lo: 59°FLo: 15°C | Hi: 70°FHi: 21°C | Lo: 59°FLo: 15°C | Hi: 70°FHi: 21°C | Lo: 59°FLo: 15°C | Hi: 70°FHi: 21°C | Lo: 59°FLo: 15°C | Hi: 76°FHi: 24°C |
| POP: 40% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 602 PM PDT Tue Sep 01 2026 
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Issued: 521 PM PDT Tue Sep 1 2026
Key Messages
Updated at 107 PM PDT Tue Sep 1 2026- Cooler weather continues through the week
- Beneficial wetting rain expected in the North Bay through Thursday
Aviation
... (00Z TAFS) Issued at 426 PM PDT Tue Sep 1 2026
VFR is expected to prevail through the remainder of today and tonight with MVFR ceilings possible after midnight for the coastal terminals. A fairly well mixed marine layer was measured at ~5000ft by the 00z KOAK balloon and is not expected to change much through the forecast period. ...