Summerville Weather Forecast

    • 45
    • 77

    Increasing Clouds

    • 42
    • 69

    Decreasing Clouds

    • 44
    • 75

    Partly Sunny

    • 44
    • 78

    Mostly Sunny

    • 46
    • 80

    Mostly Sunny

    • 49
    • 84

    Partly Sunny

    • 46
    • 83

    Partly Sunny

Today 29 Sep Grande Ronde Valley

Sunny. Highs in the upper 70s. West wind 5 to 10 Mph.

Tonight 29 Sep Grande Ronde Valley

Partly cloudy. Lows in the lower to mid 40s. Northwest wind 5 to 10 Mph in the Evening, becoming light.

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Summerville Temperature Statistics

September Temperature

La Grande/Union County Airport (13 miles)

  • Lowest 27 September, 2026

    35.1 °F

  • Average September

    58.6 °F

  • Highest 10 September, 2026

    89.1 °F

Climate (2021–2026)

La Grande/Union County Airport (13 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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