Umatilla National Forest Weather Forecast

    • 51
    • 71

    Increasing Clouds

    • 44
    • 65

    Decreasing Clouds

    • 48
    • 65

    Partly Sunny

    • 46
    • 70

    Mostly Cloudy

    • 35
    • 53

    Chance Rain Showers

    • 39
    • 52

    Partly Sunny

    • 38
    • 53

    Partly Sunny

Today 21 Sep Southern Blue Mountains of Oregon

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

Tonight 21 Sep Southern Blue Mountains of Oregon

Mostly cloudy. Lows in the upper 40s to lower 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

    57.6 °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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