La Grande/Union County Airport Weather Forecast

    • 44
    • 79

    Mostly Sunny

    • 47
    • 82

    Mostly Sunny

    • 49
    • 84

    Mostly Sunny

    • 46
    • 84

    Mostly Sunny

    • 45
    • 80

    Partly Sunny

    • 45
    • 79

    Partly Sunny

Today 19 Sep Grande Ronde Valley

Sunny. Highs in the upper 70s. Light wind.

Tonight 19 Sep Grande Ronde Valley

Mostly clear. Lows in the lower to mid 40s. North wind 5 to 10 Mph in the Evening, becoming light.

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La Grande/Union County Airport Temperature Statistics

September Temperature

La Grande/Union County Airport (0 miles)

  • Lowest 15 September, 2026

    36 °F

  • Average September

    58.3 °F

  • Highest 10 September, 2026

    89.1 °F

Climate (2021–2026)

La Grande/Union County Airport (0 miles)

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  • Average Low 2021–2026

    38.3 °F

  • Average 2021–2026

    50.5 °F

  • Average High 2021–2026

    62.7 °F
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