Umatilla National Forest Weather Forecast

    • 39
    • 66

    Rain Showers

    • 38
    • 45

    Rain Showers

    • 38
    • 56

    Mostly Sunny

    • 38
    • 58

    Mostly Sunny

    • 43
    • 61

    Mostly Sunny

    • 49
    • 69

    Mostly Sunny

Today 12 Sep Southern Blue Mountains of Oregon

Mostly cloudy. Highs in the upper 60s to mid 70s.

Tonight 12 Sep Southern Blue Mountains of Oregon

Mostly cloudy. A chance of Showers and Thunderstorms in the Evening, then a chance of rain Showers overnight. Lows in the upper 30s to mid 40s. West wind 5 to 15 Mph overnight. Gusts up to 30 Mph. Chance of precipitation 50 percent. Rainfall Amounts up to a half of an inch Possible, except higher Amounts possible in Thunderstorms.

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Umatilla National Forest Temperature Statistics

September Temperature

Grant County Regional Airport (35.4 miles)

  • Lowest 4 September, 2026

    37.8 °F

  • Average September

    58 °F

  • Highest 10 September, 2026

    86.4 °F

Climate (2021–2026)

Grant County Regional Airport (35.4 miles)

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  • Average Low 2021–2026

    39 °F

  • Average 2021–2026

    50.3 °F

  • Average High 2021–2026

    62 °F
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