Weather WorldLa Grande-Union County, OR Weather Forecast
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La Grande-Union County Weather Forecast
| TODAY | TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | SATURDAY | SATURDAY NIGHT | SUNDAY |
 |  |  |  | | | |  |  | |  | |
| Chance of T-Storm | Chance of T-Storm | Sunny | Mostly Clear | Sunny | Mostly Clear | Mostly Clear | Partly Cloudy | Partly Cloudy | Partly Cloudy | Chance of Showers | Partly Cloudy |
| Hi: 91°FHi: 33°C | Lo: 55°FLo: 13°C | Hi: 91°FHi: 33°C | Lo: 50°FLo: 10°C | Hi: 91°FHi: 33°C | Hi: 95°FHi: 35°C Lo: 53°FLo: 12°C | Hi: 95°FHi: 35°C Lo: 53°FLo: 12°C | Hi: 97°FHi: 36°C Lo: 56°FLo: 13°C | Hi: 97°FHi: 36°C Lo: 56°FLo: 13°C | Hi: 87°FHi: 31°C | Lo: 50°FLo: 10°C | Hi: 87°FHi: 31°C |
| POP: 20% | POP: 20% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 617 AM PDT Mon Aug 17 2026 
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La Grande-Union County Forecast Discussion
Issued: 517 AM PDT Mon Aug 17 2026
Key Messages
- Shower and isolated thunderstorm chances mainly across far eastern Oregon This Afternoon and Evening.
- Breezy westerly winds and low relative humidity Tuesday afternoon and evening, especially across the Columbia Basin of Oregon.
- Another chance of showers and thunderstorms toward the weekend.
Discussion
... Light west to northwest winds were seen on most stations overnight with scattered to broken high level clouds spreading over the nrn half of OR and se h...