Summerville Weather Forecast

    • 55
    • 99

    Isolated Thunderstorms

    • 53
    • 96

    Patchy Smoke

    • 47
    • 89

    Partly Sunny

    • 43
    • 85

    Mostly Sunny

    • 41
    • 79

    Partly Sunny

    • 43
    • 84

    Mostly Sunny

    • 44
    • 86

    Mostly Sunny

Today 25 Aug Grande Ronde Valley

Hot. Partly cloudy with a 20 percent chance of Showers. Highs in the mid to upper 90s. South wind 5 to 15 Mph.

Tonight 25 Aug Grande Ronde Valley

Partly cloudy. A 20 percent chance of rain Showers in the evening. Patchy smoke through the night. Lows in the mid to upper 50s. South 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 5 August, 2026

    43 °F

  • Average August

    71.5 °F

  • Highest 21 August, 2026

    102 °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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