Summerville Weather Forecast

    • 31
    • 48

    Partly Sunny

    • 29
    • 50

    Mostly Sunny

    • 27
    • 49

    Mostly Sunny

    • 28
    • 49

    Mostly Sunny

    • 28
    • 48

    Mostly Sunny

    • 29
    • 49

    Mostly Sunny

Today 13 Jan Grande Ronde Valley

Mostly sunny. Highs in the upper 40s to lower 50s. South wind 5 to 15 Mph with Gusts to around 40 Mph.

Tonight 13 Jan Grande Ronde Valley

Partly cloudy. Lows in the lower to mid 30s. Southeast wind 5 to 10 Mph.

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Summerville Temperature Statistics

January Temperature

La Grande/Union County Airport (13 miles)

  • Lowest 8 January, 2026

    30 °F

  • Average January

    40 °F

  • Highest 3 January, 2026

    54 °F

Climate (2021–Present)

La Grande/Union County Airport (13 miles)

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  • Average Low 2021–2026

    38.2 °F

  • Average 2021–2026

    50.5 °F

  • Average High 2021–2026

    62.6 °F
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