Clark Lake Weather Forecast

    • 49
    • 69

    Increasing Clouds

    • 52
    • 73

    Partly Sunny

    • 52
    • 76

    Partly Sunny

    • 53
    • 78

    Mostly Sunny

    • 56
    • 81

    Partly Sunny

    • 54
    • 80

    Partly Sunny

    • 53
    • 77

    Mostly Sunny

Today 30 Sep John Day Basin

Sunny. Highs in the 70s. Light wind.

Tonight 30 Sep John Day Basin

Partly cloudy. Lows in the mid 40s to lower 50s. North wind 5 to 10 Mph in the Evening, becoming light.

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Clark Lake Temperature Statistics

September Temperature

Grant County Regional Airport (59.7 miles)

  • Lowest 28 September, 2026

    35.6 °F

  • Average September

    58 °F

  • Highest 10 September, 2026

    86.4 °F

Climate (2021–2026)

Grant County Regional Airport (59.7 miles)

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  • Average Low 2021–2026

    39 °F

  • Average 2021–2026

    50.2 °F

  • Average High 2021–2026

    62 °F
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