Umatilla National Forest Weather Forecast
- 35
- 54
Chance Thunderstorms
- 34
- 51
Partly Sunny
- 38
- 55
Mostly Sunny
- 43
- 61
Partly Sunny
- 48
- 67
Partly Sunny
- 47
- 66
Partly Sunny
Today 29 May Southern Blue Mountains of Oregon
Partly cloudy with a chance of rain Showers in the Morning, then mostly cloudy with a chance of Showers and Thunderstorms in the afternoon. Highs in the upper 50s to mid 60s. West wind 5 to 15 Mph with Gusts to around 30 Mph in the afternoon. Chance of precipitation 50 percent. Rainfall Amounts less than a tenth of an Inch, except higher Amounts possible in Thunderstorms.
Tonight 29 May Southern Blue Mountains of Oregon
Mostly cloudy. A 20 percent chance of rain Showers in the evening. Lows in the mid to upper 30s. Northwest wind 5 to 15 Mph in the Evening, becoming light. Gusts up to 30 Mph.
Umatilla National Forest Temperature Statistics
May Temperature
Grant County Regional Airport (35.4 miles)
Lowest 18 May, 2026
31.1 °FAverage May
54.2 °FHighest 25 May, 2026
83.7 °F
Climate (2021–Present)
Grant County Regional Airport (35.4 miles)
Average Low 2021–2026
39.3 °FAverage 2021–2026
50.5 °FAverage High 2021–2026
62.3 °F