Umatilla National Forest Weather Forecast

    • 39
    • 41

    Rain/Snow

    • 46
    • 61

    Chance Rain Showers

    • 48
    • 65

    Rain Showers Likely

    • 39
    • 54

    Rain Showers

    • 37
    • 53

    Partly Sunny

    • 39
    • 56

    Partly Sunny

Today 26 May Southern Blue Mountains of Oregon

Cloudy. Rain and high mountain snow Showers in the Morning, then a chance of rain and high mountain snow Showers in the afternoon. No high mountain snow accumulation. Highs in the mid 40s to lower 50s. Chance of precipitation 90 percent.

Tonight 26 May Southern Blue Mountains of Oregon

Rain Showers. Lows in the upper 30s to lower 40s. Chance of precipitation 90 percent. Rainfall Amounts less than a tenth of an inch.

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  • Temperature Forecast NOAA

  • 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

    53.2 °F

  • Highest 23 May, 2026

    81.7 °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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