Umatilla National Forest Weather Forecast

    • 52
    • 72

    Mostly Sunny

    • 44
    • 69

    Mostly Sunny

    • 43
    • 61

    Partly Sunny

    • 38
    • 51

    Rain Showers

    • 36
    • 47

    Chance Rain Showers

    • 39
    • 56

    Mostly Sunny

Today 9 Sep Southern Blue Mountains of Oregon

Sunny. Highs in the mid 70s to lower 80s.

Tonight 9 Sep Southern Blue Mountains of Oregon

Mostly clear. Lows in the upper 40s to mid 50s.

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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

    55.1 °F

  • Highest 1 September, 2026

    83.7 °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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