Umatilla National Forest Weather Forecast

    • 40
    • 57

    Rain Showers

    • 38
    • 54

    Chance Rain Showers

    • 45
    • 64

    Mostly Sunny

    • 54
    • 72

    Mostly Sunny

    • 48
    • 69

    Mostly Sunny

    • 42
    • 62

    Partly Sunny

Today 6 Sep Southern Blue Mountains of Oregon

Mostly cloudy. A chance of rain Showers in the Morning, then a chance of Showers and Thunderstorms in the afternoon. Highs in the 60s. Chance of precipitation 50 percent. Rainfall Amounts less than a quarter of an Inch, except higher Amounts possible in Thunderstorms.

Tonight 6 Sep Southern Blue Mountains of Oregon

Mostly cloudy. Rain Showers and a chance of Thunderstorms in the Evening, then a chance of rain Showers overnight. Lows in the upper 30s to mid 40s. Gusts up to 20 Mph overnight. Chance of precipitation 90 percent. Rainfall Amounts less than a quarter of an Inch, except higher Amounts possible in Thunderstorms.

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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

    55.8 °F

  • Highest 1 September, 2026

    83.7 °F

Climate (2021–2026)

Grant County Regional Airport (35.4 miles)

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  • Average Low 2021–2026

    39.1 °F

  • Average 2021–2026

    50.3 °F

  • Average High 2021–2026

    62.1 °F
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