Umatilla National Forest Weather Forecast

    • 31
    • 44

    Mostly Cloudy

    • 35
    • 37

    Rain

    • 36
    • 41

    Rain/Snow Likely

    • 31
    • 38

    Snow Likely

    • 30
    • 35

    Chance Snow

    • 27
    • 34

    Chance Snow

Today 31 Dec Southern Blue Mountains of Oregon

Partly sunny. Highs in the 40s. Gusts up to 20 Mph in the morning.

Tonight 31 Dec Southern Blue Mountains of Oregon

Mostly cloudy. Lows in the mid 20s to lower 30s.

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Umatilla National Forest Temperature Statistics

December Temperature

Grant County Regional Airport (35.4 miles)

  • Lowest 1 December, 2025

    18.3 °F

  • Average December

    40.8 °F

  • Highest 15 December, 2025

    60.4 °F

Climate (2020–Present)

Grant County Regional Airport (35.4 miles)

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  • Average Low 2020–2025

    39.3 °F

  • Average 2020–2025

    50.5 °F

  • Average High 2020–2025

    62.3 °F
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