Umatilla National Forest Weather Forecast

    • 51
    • 74

    Mostly Sunny

    • 52
    • 76

    Sunny

    • 51
    • 71

    Sunny

    • 55
    • 75

    Sunny

    • 60
    • 83

    Sunny

    • 61
    • 83

    Mostly Sunny

Today 18 Aug Southern Blue Mountains of Oregon

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

Tonight 18 Aug Southern Blue Mountains of Oregon

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

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Umatilla National Forest Temperature Statistics

August Temperature

Grant County Regional Airport (35.4 miles)

  • Lowest 8 August, 2025

    43.9 °F

  • Average August

    69.8 °F

  • Highest 12 August, 2025

    98.6 °F

Climate (2020–Present)

Grant County Regional Airport (35.4 miles)

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  • Average Low 2020–2025

    39.1 °F

  • Average 2020–2025

    50.4 °F

  • Average High 2020–2025

    62.2 °F
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