Summerville Weather Forecast

    • 42
    • 75

    Sunny

    • 48
    • 84

    Mostly Sunny

    • 45
    • 83

    Chance Rain Showers

    • 41
    • 71

    Partly Sunny

    • 41
    • 68

    Rain Showers Likely

    • 38
    • 65

    Chance Rain Showers

    • 40
    • 71

    Mostly Sunny

Today 8 Sep Grande Ronde Valley

Sunny. Highs in the mid 70s. Light wind.

Tonight 8 Sep Grande Ronde Valley

Clear. Lows in the lower to mid 40s. Light wind.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Summerville Temperature Statistics

September Temperature

La Grande/Union County Airport (13 miles)

  • Lowest 4 September, 2026

    39 °F

  • Average September

    56.9 °F

  • Highest 1 September, 2026

    82 °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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