Summerville Weather Forecast

    • 34
    • 64

    Mostly Sunny

    • 38
    • 68

    Partly Sunny

    • 39
    • 70

    Partly Sunny

    • 41
    • 73

    Partly Sunny

    • 43
    • 76

    Mostly Sunny

    • 44
    • 79

    Partly Sunny

    • 42
    • 77

    Partly Sunny

Today 18 May Grande Ronde Valley

Partly cloudy. Highs in the mid 60s. Northwest wind 5 to 15 Mph.

Tonight 18 May Grande Ronde Valley

Mostly clear. Lows in the mid 30s. 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

    59.2 °F

  • Highest 12 May, 2026

    91 °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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