Summerville Weather Forecast

    • 56
    • 94

    Patchy Smoke

    • 49
    • 86

    Partly Sunny

    • 49
    • 86

    Sunny

    • 51
    • 89

    Sunny

    • 53
    • 90

    Mostly Sunny

    • 54
    • 89

    Partly Sunny

Today 7 Jul Grande Ronde Valley

Sunny. Patchy smoke through the day. A 20 percent chance of rain Showers in the afternoon. Highs in the lower to mid 90s. Light wind.

Tonight 7 Jul Grande Ronde Valley

Mostly clear. Patchy smoke in the evening. Lows in the mid to upper 50s. Light Wind, becoming northwest 5 to 10 Mph overnight.

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Summerville Temperature Statistics

July Temperature

La Grande/Union County Airport (13 miles)

  • Lowest 2 July, 2026

    48 °F

  • Average July

    65.4 °F

  • Highest 4 July, 2026

    88 °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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