Summerville Weather Forecast

    • 43
    • 66

    Clearing Late

    • 44
    • 78

    Mostly Sunny

    • 45
    • 76

    Rain Showers Likely

    • 44
    • 77

    Slight Chance Rain Showers

    • 46
    • 80

    Mostly Sunny

    • 47
    • 83

    Mostly Sunny

    • 45
    • 82

    Partly Sunny

Today 15 Sep Grande Ronde Valley

Mostly cloudy. Highs in the upper 60s to lower 70s. Light wind.

Tonight 15 Sep Grande Ronde Valley

Mostly cloudy. Lows in the lower to mid 40s. Northwest wind 5 to 15 Mph. Gusts up to 25 Mph overnight.

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  • Temperature Real-Time

Summerville Temperature Statistics

September Temperature

La Grande/Union County Airport (13 miles)

  • Lowest 4 September, 2026

    39 °F

  • Average September

    58.5 °F

  • Highest 10 September, 2026

    89.1 °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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