Weather WorldUpper Reservoir, OR Weather Forecast
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Upper Reservoir Weather Forecast
| REST OF TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | FRIDAY | SATURDAY | SUNDAY |
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| Mostly Clear | Sunny | Mostly Clear | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy |
| Lo: 36°FLo: 2°C | Hi: 65°FHi: 18°C | Lo: 40°FLo: 4°C | Hi: 66°FHi: 19°C | Lo: 45°FLo: 7°C | Hi: 65°FHi: 18°C Lo: 45°FLo: 7°C | Hi: 65°FHi: 18°C Lo: 45°FLo: 7°C | Hi: 70°FHi: 21°C Lo: 46°FLo: 8°C | Hi: 70°FHi: 21°C Lo: 46°FLo: 8°C | Hi: 70°FHi: 21°C Lo: 46°FLo: 8°C | Hi: 70°FHi: 21°C Lo: 46°FLo: 8°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 1147 PM PDT Sun Sep 27 2026 
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Issued: 1014 PM PDT Sun Sep 27 2026
Key Messages
- Patchy frost/freezing temperatures possible in Central Oregon and Kittitas Valley tonight.
- Warmer high temperatures through the week with zonal/split flow aloft.
- Showers (50-70% chance) developing along the Cascades Tuesday with a shortwave passing through British Colombia.
Discussion
... Radar advertising light returns across as a low pressure system centered around northern California advects moisture across the Blue and Eastern Mountains through this afternoon. The exiting of the lo...