Umatilla National Forest Weather Forecast

    • 45
    • 65

    Mostly Sunny

    • 46
    • 68

    Becoming Sunny

    • 48
    • 69

    Mostly Sunny

    • 35
    • 69

    Snow Showers Likely

    • 36
    • 42

    Snow Showers

    • 38
    • 48

    Chance Rain Showers

    • 43
    • 57

    Chance Rain Showers

Today 22 May Southern Blue Mountains of Oregon

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

Tonight 22 May Southern Blue Mountains of Oregon

Mostly clear. Lows in the 40s.

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  • Temperature Real-Time

Umatilla National Forest Temperature Statistics

May Temperature

Grant County Regional Airport (35.4 miles)

  • Lowest 18 May, 2026

    31.1 °F

  • Average May

    50.5 °F

  • Highest 14 May, 2026

    70.2 °F

Climate (2021–Present)

Grant County Regional Airport (35.4 miles)

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  • Average Low 2021–2026

    39.3 °F

  • Average 2021–2026

    50.5 °F

  • Average High 2021–2026

    62.3 °F
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