Umatilla National Forest Weather Forecast

    • 38
    • 54

    Partly Sunny

    • 39
    • 56

    Decreasing Clouds

    • 42
    • 60

    Mostly Sunny

    • 45
    • 65

    Mostly Sunny

    • 46
    • 67

    Mostly Sunny

    • 46
    • 68

    Partly Sunny

    • 35
    • 58

    Slight Chance Snow Showers

Today 19 May Southern Blue Mountains of Oregon

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

Tonight 19 May Southern Blue Mountains of Oregon

Partly cloudy. Lows in the mid 30s to lower 40s. Gusts up to 20 Mph in the evening.

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Umatilla National Forest Temperature Statistics

May Temperature

Grant County Regional Airport (35.4 miles)

  • Lowest 17 May, 2026

    32.9 °F

  • Average May

    49.3 °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

    62.2 °F
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