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Foster City Weather Forecast
| TODAY | TONIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT |
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| Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Mostly Cloudy | Mostly Clear | Partly Cloudy | Partly Cloudy | Partly Cloudy | Mostly Clear | Mostly Clear | Clear |
| Hi: 80°FHi: 27°C | Lo: 59°FLo: 15°C | Hi: 76°FHi: 24°C | Lo: 60°FLo: 16°C | Hi: 75°FHi: 24°C | Lo: 55°FLo: 13°C | Hi: 75°FHi: 24°C Lo: 55°FLo: 13°C | Hi: 75°FHi: 24°C Lo: 55°FLo: 13°C | Hi: 66°FHi: 19°C | Hi: 75°FHi: 24°C Lo: 55°FLo: 13°C | Hi: 75°FHi: 24°C Lo: 55°FLo: 13°C | Lo: 59°FLo: 15°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 602 AM PDT Wed Sep 23 2026 
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Issued: 511 AM PDT Wed Sep 23 2026
Key Messages
Updated at 1232 PM PDT Tue Sep 22 2026- Warming trend continues through Thursday
- Cooler conditions Friday into the weekend
Aviation
... (12Z TAFS) Issued at 445 AM PDT Wed Sep 23 2026
Marine layer returned, but a tad more compressed this morning in the 1500-1800 foot range. As such, seeing more reduced vis with LIFR conditions for N Bay and Monterey Bay regions. Elsewhere IFR for SF Bay and VFR for S and E Bays. Expecting VFR this afternoon as N-S increases. Less CIGs expected tonight wi...