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Upper Lake, OR Weather Forecast
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Upper Lake Weather Forecast
| REST OF TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | MONDAY | TUESDAY | WEDNESDAY | THURSDAY |
 |  | |  |  |  | | | | |
| Smoke | Mostly Cloudy | Smoke | Partly Cloudy | Chance of Showers | Mostly Clear | Mostly Clear | Mostly Clear | Mostly Clear | Mostly Clear |
| Lo: 69°FLo: 21°C | Lo: 69°FLo: 21°C | Lo: 59°FLo: 15°C | |||||||
| POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1132 PM PDT Thu Aug 20 2026 
Upper Lake Radar Loop
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Upper Lake Weather Map
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Upper Lake Forecast Discussion
Issued: 1009 PM PDT Thu Aug 20 2026
Key Messages
- Hot temperatures through Friday -- Heat Advisories in effect.
- Very low to slight chance (5-20 percent) of high-based showers and thunderstorms Friday and Saturday.
- Widespread breezy to windy westerly winds coupled with low relative humidity Saturday -- Fire Weather Watches in effect.
Discussion
... Water vapor imagery shows a large, closed low offshore in the Pacific. Meanwhile, an upper-level ridge of high pressure extends from the Four Corners into the P...