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City of Clayton, CAClayton, CA Weather Forecast
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Clayton Weather Forecast
| REST OF TODAY | TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | MONDAY |
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| Sunny | Mostly Clear | Sunny | Mostly Cloudy | Partly Cloudy | Mostly Clear | Partly Cloudy | Clear | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy |
| Hi: 85°FHi: 29°C | Lo: 59°FLo: 15°C | Hi: 76°FHi: 24°C | Lo: 59°FLo: 15°C | Hi: 81°FHi: 27°C | Lo: 59°FLo: 15°C | Hi: 89°FHi: 32°C | Lo: 59°FLo: 15°C | Hi: 89°FHi: 32°C | Hi: 81°FHi: 27°C Lo: 59°FLo: 15°C | Hi: 81°FHi: 27°C Lo: 59°FLo: 15°C | Hi: 85°FHi: 29°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 1102 AM PDT Tue Sep 15 2026 
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Issued: 1106 AM PDT Tue Sep 15 2026
Key Messages
Updated at 1051 AM PDT Tue Sep 15 2026- Cooler temperatures through Thursday
Aviation
... (18Z TAFS) Issued at 1029 AM PDT Tue Sep 15 2026
MVFR-IFR conditions continue directly along the coastline with VFR across the interior. MVFR stratus returns again tonight with IFR conditions possible directly along the coastline. Confidence is low to moderate that stratus will not reach SJC or LVK overnight but if it does occur, it likely will not be until after 09Z. Highest potential for IFR condi...