Umatilla National Forest Weather Forecast

    • 45
    • 59

    Becoming Sunny

    • 48
    • 65

    Mostly Sunny

    • 52
    • 71

    Mostly Sunny

    • 51
    • 70

    Mostly Sunny

    • 47
    • 68

    Partly Sunny

    • 51
    • 67

    Partly Sunny

    • 52
    • 72

    Partly Sunny

Today 18 Sep Southern Blue Mountains of Oregon

Sunny. Highs in the mid 60s to lower 70s.

Tonight 18 Sep Southern Blue Mountains of Oregon

Mostly clear. Lows in the 40s.

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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

    57.8 °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

    50.2 °F

  • Average High 2021–2026

    62 °F
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