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Corvallis Reservoir Weather Forecast
| TODAY | TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT |
 |  |  | | |  |  |  | | | | |
| Sunny | Mostly Clear | Clearing | Mostly Clear | Sunny | Chance of Rain | Mostly Cloudy | Partly Cloudy | Mostly Cloudy | Mostly Clear | Mostly Sunny | Mostly Clear |
| Hi: 85°FHi: 29°C | Lo: 51°FLo: 11°C | Hi: 85°FHi: 29°C | Lo: 51°FLo: 11°C | Hi: 89°FHi: 32°C | Lo: 55°FLo: 13°C | Hi: 80°FHi: 27°C | Lo: 51°FLo: 11°C | Hi: 79°FHi: 26°C | Lo: 51°FLo: 11°C | Hi: 81°FHi: 27°C | Lo: 51°FLo: 11°C |
| POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 501 AM PDT Tue Aug 18 2026 
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Corvallis Reservoir Forecast Discussion
Issued: 411 AM PDT Tue Aug 18 2026
Discussion
...Today through Monday...Little change to the forecast as predominately dry and warm conditions continue through the week with minimal impacts. The large-scale pattern remains stagnant through the period, with broad and relatively flat upper-level ridging over the Rockies and Great Basin, and broad upper-level troughing over the northeast Pacific. This pattern will support continued onshore flow, maintaining near- normal daily high temperatures in the 80s...