Twentymile Lake Weather Forecast

    • 46
    • 65

    Mostly Sunny

    • 53
    • 74

    Mostly Sunny

    • 57
    • 80

    Mostly Sunny

    • 57
    • 81

    Partly Sunny

    • 54
    • 78

    Chance Rain

    • 52
    • 73

    Slight Chance Thunderstorms

Today 28 Jun Southern Clearwater Mountains

Partly cloudy. Highs 63 to 78.

Tonight 28 Jun Southern Clearwater Mountains

Mostly clear. Patchy fog after midnight. Lows 39 to 54.

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Twentymile Lake Temperature Statistics

June Temperature

Grangeville - Idaho County Airport (24.9 miles)

  • Lowest 4 June, 2025

    35.6 °F

  • Average June

    60.4 °F

  • Highest 10 June, 2025

    89.6 °F

Climate (2020–Present)

Grangeville - Idaho County Airport (24.9 miles)

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  • Average Low 2020–2025

    36.4 °F

  • Average 2020–2025

    46.9 °F

  • Average High 2020–2025

    57.4 °F
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