Summerville Weather Forecast

    • 52
    • 86

    Sunny

    • 53
    • 91

    Sunny

    • 55
    • 93

    Mostly Sunny

    • 54
    • 85

    Partly Sunny

    • 53
    • 83

    Mostly Cloudy

    • 51
    • 81

    Partly Sunny

    • 53
    • 83

    Mostly Sunny

Today 16 Jul Grande Ronde Valley

Sunny. Highs in the upper 80s. Light Wind, becoming northwest 5 to 10 Mph in the afternoon.

Tonight 16 Jul Grande Ronde Valley

Clear. Lows in the lower to mid 50s. Northwest wind 5 to 10 Mph in the Evening, becoming light.

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Summerville Temperature Statistics

July Temperature

La Grande/Union County Airport (13 miles)

  • Lowest 5 July, 2025

    46.4 °F

  • Average July

    72.2 °F

  • Highest 13 July, 2025

    98.1 °F

Climate (2020–Present)

La Grande/Union County Airport (13 miles)

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  • Average Low 2020–2025

    37.8 °F

  • Average 2020–2025

    50.2 °F

  • Average High 2020–2025

    62.3 °F
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