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Windfall Adverse Weather Forecast
| THIS AFTERNOON | TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT |
 |  |  | | | | | | | |  |  |
| Chance of Showers | Mostly Clear | Sunny | Mostly Clear | Sunny | Mostly Clear | Sunny | Mostly Clear | Mostly Sunny | Mostly Clear | Partly Sunny | Partly Cloudy |
| Hi: 79°FHi: 26°C | Lo: 50°FLo: 10°C | Hi: 75°FHi: 24°C | Lo: 49°FLo: 9°C | Hi: 79°FHi: 26°C | Lo: 51°FLo: 11°C | Hi: 81°FHi: 27°C | Lo: 51°FLo: 11°C | Hi: 75°FHi: 24°C | Lo: 49°FLo: 9°C | Hi: 69°FHi: 21°C | Lo: 49°FLo: 9°C |
| POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1128 AM PDT Thu Sep 17 2026 
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Issued: 1106 AM PDT Thu Sep 17 2026
Discussion
..Now through Wednesday...The upper-level low over northern California will begin shifting northeast toward the Great Basin today as ridging builds eastward across the Pacific Northwest. This will allow the surface thermal trough to weaken through the day, but not before another warm afternoon across the interior lowlands. Highs are expected to reach the low to mid 80s, with the warmest readings from the Portland metro to Corvallis. There is a 30-70% probability of temperatures reachin...