Summerville Weather Forecast

    • 43
    • 76

    Mostly Sunny

    • 49
    • 89

    Partly Sunny

    • 40
    • 66

    Chance Rain Showers

    • 38
    • 66

    Slight Chance Rain Showers

    • 36
    • 65

    Partly Sunny

    • 34
    • 56

    Partly Sunny

    • 35
    • 61

    Partly Sunny

Today 11 May Grande Ronde Valley

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

Tonight 11 May Grande Ronde Valley

Mostly clear. Lows in the lower to mid 40s. North wind 5 to 10 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

    61.4 °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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