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City of Clearlake, CAClearlake, CA Weather Forecast
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Clearlake Weather Forecast
| TODAY | TONIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT |
 |  |  | | | | | | |  | | |
| Sunny | Mostly Clear | Clearing | Clear | Sunny | Clear | Mostly Clear | Mostly Clear | Partly Cloudy | Partly Cloudy | Mostly Clear | Mostly Clear |
| Hi: 80°FHi: 27°C | Lo: 51°FLo: 11°C | Hi: 78°FHi: 26°C | Lo: 55°FLo: 13°C | Hi: 87°FHi: 31°C | Lo: 60°FLo: 16°C | Hi: 90°FHi: 32°C Lo: 61°FLo: 16°C | Hi: 90°FHi: 32°C Lo: 61°FLo: 16°C | Hi: 89°FHi: 32°C Lo: 61°FLo: 16°C | Hi: 89°FHi: 32°C Lo: 61°FLo: 16°C | Hi: 91°FHi: 33°C Lo: 62°FLo: 17°C | Hi: 91°FHi: 33°C Lo: 62°FLo: 17°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 136 AM PDT Wed Sep 16 2026 
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Issued: 1211 AM PDT Wed Sep 16 2026
Key Messages
- A weak frontal system arriving Wednesday will likely lead to cooler temperatures and a few showers or thunderstorms.
- There is a slight chance for thunderstorms in mainly in Trinity, Humboldt and Del Norte counties on Wednesday.
- Warmer temperatures and dry conditions return end of the week.
Discussion
...An upper level low dropping south over the area is expected to impact the area Wednesday and Thursday. This is expected to bring some showers and possible thunderstorms to the area Wedn...