La Grande Reservoir Weather Forecast

    • 44
    • 68

    Partly Sunny

    • 46
    • 75

    Increasing Clouds

    • 32
    • 56

    Chance Rain Showers

    • 36
    • 52

    Partly Sunny

    • 33
    • 54

    Partly Sunny

    • 34
    • 54

    Partly Sunny

    • 37
    • 58

    Partly Sunny

Today 23 Sep Southern Blue Mountains of Oregon

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

Tonight 23 Sep Southern Blue Mountains of Oregon

Partly cloudy. Lows in the mid to upper 40s.

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La Grande Reservoir Temperature Statistics

September Temperature

La Grande/Union County Airport (13.7 miles)

  • Lowest 15 September, 2026

    36 °F

  • Average September

    59.1 °F

  • Highest 10 September, 2026

    89.1 °F

Climate (2021–2026)

La Grande/Union County Airport (13.7 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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