Summerville Weather Forecast

    • 48
    • 88

    Areas Smoke

    • 52
    • 96

    Areas Smoke

    • 57
    • 101

    Hot

    • 55
    • 97

    Hot

    • 53
    • 94

    Mostly Sunny

    • 50
    • 89

    Mostly Sunny

Today 4 Aug Grande Ronde Valley

Sunny. Areas of smoke. Highs in the mid 80s. North wind 5 to 10 Mph.

Tonight 4 Aug Grande Ronde Valley

Mostly clear. Areas of smoke. Lows in the mid 40s to lower 50s. North wind 5 to 10 Mph in the Evening, becoming light.

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Summerville Temperature Statistics

August Temperature

La Grande/Union County Airport (13 miles)

  • Lowest 2 August, 2026

    48.9 °F

  • Average August

    69.7 °F

  • Highest 1 August, 2026

    88 °F

Climate (2021–2026)

La Grande/Union County Airport (13 miles)

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  • Average Low 2021–2026

    38.3 °F

  • Average 2021–2026

    50.5 °F

  • Average High 2021–2026

    62.7 °F
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