Summerville Weather Forecast

    • 38
    • 52

    Partly Sunny

    • 39
    • 50

    Rain

    • 36
    • 51

    Rain

    • 30
    • 45

    Rain/Snow Likely

    • 34
    • 43

    Rain/Snow

    • 29
    • 45

    Rain/Snow Likely

Today 14 Dec Grande Ronde Valley

Mostly sunny. Highs in the lower 50s. Breezy. South wind 10 to 20 Mph.

Tonight 14 Dec Grande Ronde Valley

Mostly cloudy. Lows in the upper 30s. Breezy. South wind 10 to 20 Mph.

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Summerville Temperature Statistics

December Temperature

La Grande/Union County Airport (13 miles)

  • Lowest 1 December, 2025

    23 °F

  • Average December

    40.9 °F

  • Highest 11 December, 2025

    57.9 °F

Climate (2020–Present)

La Grande/Union County Airport (13 miles)

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  • Average Low 2020–2025

    38.1 °F

  • Average 2020–2025

    50.4 °F

  • Average High 2020–2025

    62.5 °F
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