Twentymile Lake Weather Forecast

    • 27
    • 40

    Chance Snow

    • 30
    • 43

    Chance Snow

    • 34
    • 46

    Chance Rain/Snow

    • 34
    • 51

    Slight Chance Snow

    • 37
    • 59

    Partly Sunny

    • 40
    • 60

    Slight Chance Rain

Today 26 Apr Southern Clearwater Mountains

Mostly cloudy. Areas of frost and patchy fog early in the morning. A 30 percent chance of Areas of rain and snow in the afternoon. Highs 41 to 54.

Tonight 26 Apr Southern Clearwater Mountains

Partly cloudy. A 20 percent chance of rain and snow in the evening. Areas of frost and patchy fog after midnight. Lows in the 20s to mid 30s.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Twentymile Lake Temperature Statistics

April Temperature

Grangeville - Idaho County Airport (24.9 miles)

  • Lowest 18 April, 2026

    26.6 °F

  • Average April

    45.7 °F

  • Highest 6 April, 2026

    69.8 °F

Climate (2021–Present)

Grangeville - Idaho County Airport (24.9 miles)

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  • Average Low 2021–2026

    37.1 °F

  • Average 2021–2026

    47.5 °F

  • Average High 2021–2026

    58 °F
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