Summerville Weather Forecast

    • 39
    • 71

    Becoming Sunny

    • 43
    • 75

    Partly Sunny

    • 41
    • 80

    Partly Sunny

    • 43
    • 78

    Mostly Sunny

    • 47
    • 87

    Partly Sunny

    • 44
    • 78

    Mostly Sunny

    • 43
    • 77

    Partly Sunny

Today 8 May Grande Ronde Valley

Mostly cloudy. Highs in the lower to mid 70s. Northwest wind 5 to 10 Mph with Gusts to around 25 Mph.

Tonight 8 May Grande Ronde Valley

Clear. Lows around 40. Northwest wind 5 to 15 Mph with Gusts to around 25 Mph in the Evening, becoming light.

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Summerville Temperature Statistics

May Temperature

La Grande/Union County Airport (13 miles)

  • Lowest 1 May, 2026

    36 °F

  • Average May

    62.9 °F

  • Highest 2 May, 2026

    80.1 °F

Climate (2021–Present)

La Grande/Union County Airport (13 miles)

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  • Average Low 2021–2026

    38.4 °F

  • Average 2021–2026

    50.7 °F

  • Average High 2021–2026

    62.8 °F
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