Summerville Weather Forecast

    • 40
    • 85

    Rain Showers

    • 42
    • 55

    Rain Showers

    • 45
    • 73

    Partly Sunny

    • 47
    • 80

    Rain Showers Likely

    • 41
    • 69

    Rain Showers Likely

    • 39
    • 68

    Partly Sunny

    • 40
    • 70

    Partly Sunny

Today 25 May Grande Ronde Valley

Partly cloudy. Highs in the mid to upper 80s. South wind 5 to 15 Mph with Gusts to around 30 Mph.

Tonight 25 May Grande Ronde Valley

Mostly cloudy. A chance of Showers and Thunderstorms in the Evening, then rain Showers likely overnight. Lows around 40. Windy. Northwest wind 15 to 25 Mph with Gusts to around 35 Mph. Chance of precipitation 70 percent. Rainfall Amounts less than a tenth of an Inch, except higher Amounts possible in Thunderstorms.

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Summerville Temperature Statistics

May Temperature

La Grande/Union County Airport (13 miles)

  • Lowest 19 May, 2026

    33.1 °F

  • Average May

    57.9 °F

  • Highest 12 May, 2026

    91 °F

Climate (2021–Present)

La Grande/Union County Airport (13 miles)

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  • Average Low 2021–2026

    38.4 °F

  • Average 2021–2026

    50.7 °F

  • Average High 2021–2026

    62.9 °F
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