Summerville Weather Forecast

    • 49
    • 91

    Mostly Sunny

    • 52
    • 92

    Areas Smoke

    • 58
    • 97

    Hot

    • 56
    • 94

    Mostly Cloudy

    • 46
    • 87

    Mostly Sunny

    • 48
    • 86

    Mostly Sunny

    • 52
    • 91

    Mostly Sunny

Today 18 Aug Grande Ronde Valley

Sunny. Highs in the lower 90s. Northwest wind 5 to 10 Mph.

Tonight 18 Aug Grande Ronde Valley

Mostly clear. Lows in the upper 40s to lower 50s. Northwest wind 5 to 10 Mph with Gusts to around 20 Mph in the Evening, becoming light.

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Summerville Temperature Statistics

August Temperature

La Grande/Union County Airport (13 miles)

  • Lowest 5 August, 2026

    43 °F

  • Average August

    70.4 °F

  • Highest 7 August, 2026

    99 °F

Climate (2021–2026)

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

    62.7 °F
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