Summerville Weather Forecast

    • 27
    • 58

    Mostly Sunny

    • 32
    • 61

    Mostly Sunny

    • 32
    • 61

    Partly Sunny

    • 41
    • 65

    Rain Showers Likely

    • 34
    • 60

    Rain Showers

    • 29
    • 52

    Chance Rain Showers

Today 15 Oct Grande Ronde Valley

Sunny. Highs around 60. Northwest wind 5 to 15 Mph.

Tonight 15 Oct Grande Ronde Valley

Mostly clear. Widespread frost overnight. Lows in the mid 20s to lower 30s. Northwest wind 5 to 10 Mph in the Evening, becoming light.

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Summerville Temperature Statistics

October Temperature

La Grande/Union County Airport (13 miles)

  • Lowest 6 October, 2025

    27 °F

  • Average October

    53.5 °F

  • Highest 9 October, 2025

    80.1 °F

Climate (2020–Present)

La Grande/Union County Airport (13 miles)

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  • Average Low 2020–2025

    37.9 °F

  • Average 2020–2025

    50.2 °F

  • Average High 2020–2025

    62.3 °F
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