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Upper Lake Weather Forecast
| TODAY | TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | TUESDAY | WEDNESDAY |
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| Sunny | Mostly Clear | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Mostly Clear | Mostly Clear | Mostly Clear |
| Hi: 91°FHi: 33°C | Lo: 69°FLo: 21°C | Hi: 91°FHi: 33°C | Lo: 69°FLo: 21°C | Hi: 85°FHi: 29°C | Lo: 69°FLo: 21°C | Hi: 85°FHi: 29°C | Lo: 69°FLo: 21°C | Hi: 89°FHi: 32°C Lo: 65°FLo: 18°C | Hi: 89°FHi: 32°C Lo: 65°FLo: 18°C | Hi: 89°FHi: 32°C Lo: 65°FLo: 18°C |
| POP: 30% | POP: 40% | POP: 80% | POP: 80% | POP: 30% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 407 AM EDT Thu Sep 10 2026 
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Issued: 157 PM EDT Thu Sep 10 2026
Key Messages
As of 215 PM Thursday...
1) Hot temperatures to persist through the end of the week, with limited cooling this weekend. Warm temperature return next week.
2) Unsettled weather returns Friday and Saturday with a Marginal Risk for excessive rain (flash flooding).
Discussion
... As of 157 PM Thursday...
KEY MESSAGE 1... Hot temperatures to persist through the end of the week, with limited cooling this weekend. Warm temperature return next week.
Early afternoon water vapor imagery reveals an u...