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Harrison Square Weather Forecast
| REST OF TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SUNDAY | SUNDAY NIGHT |
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| Mostly Cloudy | Mostly Cloudy | Partly Cloudy | Mostly Cloudy | Mostly Clear | Partly Cloudy | Partly Cloudy | Partly Cloudy | Mostly Clear | Partly Cloudy | Partly Cloudy | Mostly Clear |
| Lo: 59°FLo: 15°C | Hi: 75°FHi: 24°C | Lo: 55°FLo: 13°C | Hi: 80°FHi: 27°C | Lo: 59°FLo: 15°C | Hi: 76°FHi: 24°C | Hi: 75°FHi: 24°C Lo: 60°FLo: 16°C | Hi: 75°FHi: 24°C Lo: 60°FLo: 16°C | Lo: 59°FLo: 15°C | Hi: 77°FHi: 25°C Lo: 55°FLo: 13°C | Hi: 77°FHi: 25°C Lo: 55°FLo: 13°C | Hi: 75°FHi: 24°C Lo: 55°FLo: 13°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 302 AM PDT Tue Sep 22 2026 
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Issued: 1202 AM PDT Tue Sep 22 2026
Key Messages
Updated at 1201 AM PDT Tue Sep 22 2026- Warming trend begins today through Thursday
- Cooler conditions Friday into the weekend
Aviation
... (06Z TAFS) Issued at 1021 PM PDT Mon Sep 21 2026
Extensive MVFR-IFR stratus has flowed into the North Bay and the Monterey Bay region, and continues to develop in the SF Bay region. A deep marine layer should allow many of the inland valleys to see ceilings overnight before the stratus retreats back to the immediate coast late Tuesday morning. Low to ...