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City of Sunnyvale, CaliforniaSunnyvale, CA Weather Forecast
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Sunnyvale Weather Forecast
| REST OF TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SUNDAY | LABOR DAY |
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| Mostly Cloudy | Mostly Cloudy | Patchy Fog | Patchy Fog | Partly Cloudy | Partly Cloudy | Drizzle | Partly Cloudy | Mostly Clear | Mostly Clear | Mostly Clear | Partly Cloudy |
| Lo: 55°FLo: 13°C | Hi: 73°FHi: 23°C | Lo: 55°FLo: 13°C | Hi: 75°FHi: 24°C | Lo: 59°FLo: 15°C | Hi: 75°FHi: 24°C | Lo: 59°FLo: 15°C | Hi: 75°FHi: 24°C | Hi: 76°FHi: 24°C Lo: 55°FLo: 13°C | Hi: 76°FHi: 24°C Lo: 55°FLo: 13°C | Hi: 76°FHi: 24°C Lo: 55°FLo: 13°C | Hi: 85°FHi: 29°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 302 AM PDT Tue Sep 01 2026 
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Issued: 420 AM PDT Tue Sep 1 2026
Key Messages
Updated at 1039 PM PDT Mon Aug 31 2026- Cooler weather continues through the week
- Beneficial wetting rain expected in the North Bay
Aviation
... (12Z TAFS) Issued at 416 AM PDT Tue Sep 1 2026
Extensive MVFR to low-end VFR stratus should continue through the sunrise hours, clearing back to the immediate coast through the course of the post-sunrise hours into the early afternoon, with a gentle to moderate onshore pattern wind developing in the afternoon and evening hours. Tonight, lower co...