Summerville Weather Forecast

    • 50
    • 90

    Areas Smoke

    • 49
    • 87

    Patchy Smoke

    • 50
    • 84

    Mostly Sunny

    • 51
    • 87

    Slight Chance Thunderstorms

    • 52
    • 88

    Chance Rain Showers

    • 54
    • 90

    Chance Rain Showers

Today 11 Aug Grande Ronde Valley

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

Tonight 11 Aug Grande Ronde Valley

Mostly clear. Patchy smoke through the night. Lows in the upper 40s to lower 50s. Northwest wind 5 to 15 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

    70.5 °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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