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City of San Mateo, CASan Mateo, CA Weather Forecast
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| TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY |
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| Mostly Cloudy | Partly Cloudy | Partly Cloudy | Mostly Cloudy | Clear | Sunny | Clear | Mostly Clear | Mostly Clear | Partly Cloudy | Partly Cloudy | Partly Cloudy |
| Lo: 55°FLo: 13°C | Hi: 66°FHi: 19°C | Lo: 55°FLo: 13°C | Hi: 75°FHi: 24°C | Lo: 55°FLo: 13°C | Hi: 85°FHi: 29°C | Lo: 59°FLo: 15°C | Hi: 76°FHi: 24°C Lo: 59°FLo: 15°C | Hi: 76°FHi: 24°C Lo: 59°FLo: 15°C | Hi: 76°FHi: 24°C | Lo: 59°FLo: 15°C | Hi: 76°FHi: 24°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 602 PM PDT Sat Sep 26 2026 
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Issued: 442 PM PDT Sat Sep 26 2026
Key Messages
Updated at 1204 PM PDT Sat Sep 26 2026- Cooler conditions through Sunday
- Warmer temperatures return Tuesday through the next week
Aviation
... (00Z TAFS) Issued at 429 PM PDT Sat Sep 26 2026
VFR across the board this afternoon. Similar to last night and earlier this morning, there is uncertainty in the timing and extent of stratus development tonight into Sunday. The KOAK 00z sounding measured a relatively weak marine layer up to approximately 1000ft. MVFR/IFR ceilings are possible after...