Umatilla National Forest Weather Forecast

    • 36
    • 57

    Gradual Clearing

    • 41
    • 58

    Mostly Sunny

    • 45
    • 61

    Partly Sunny

    • 41
    • 60

    Partly Sunny

    • 47
    • 66

    Partly Sunny

    • 46
    • 65

    Partly Sunny

    • 46
    • 63

    Mostly Sunny

Today 27 Sep Southern Blue Mountains of Oregon

Mostly cloudy. Highs in the upper 50s to mid 60s.

Tonight 27 Sep Southern Blue Mountains of Oregon

Mostly cloudy in the evening then clearing. Lows in the mid to upper 30s.

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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

    58.9 °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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