Twentymile Lake Weather Forecast

    • 26
    • 37

    Increasing Clouds

    • 21
    • 37

    Partly Sunny

    • 23
    • 37

    Partly Sunny

    • 21
    • 35

    Partly Sunny

    • 21
    • 31

    Partly Sunny

    • 23
    • 33

    Chance Snow

Today 19 Jan Southern Clearwater Mountains

Mostly sunny. Patchy fog in the morning. Highs in the mid 30s to lower 40s.

Tonight 19 Jan Southern Clearwater Mountains

Partly cloudy. Lows 17 to 29.

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  • Temperature Real-Time

Twentymile Lake Temperature Statistics

January Temperature

Grangeville - Idaho County Airport (24.9 miles)

  • Lowest 16 January, 2026

    21.2 °F

  • Average January

    34.5 °F

  • Highest 3 January, 2026

    51.8 °F

Climate (2021–Present)

Grangeville - Idaho County Airport (24.9 miles)

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  • Average Low 2021–2026

    36.9 °F

  • Average 2021–2026

    47.3 °F

  • Average High 2021–2026

    57.8 °F
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