Crystal Lake Weather Forecast

    • 43
    • 61

    Mostly Sunny

    • 39
    • 63

    Chance Rain

    • 38
    • 55

    Partly Sunny

    • 32
    • 57

    Rain/Snow

    • 30
    • 37

    Snow

    • 31
    • 46

    Mostly Sunny

    • 35
    • 51

    Partly Sunny

Today 9 Sep Southern Clearwater Mountains

Mostly sunny. Patchy fog early in the morning. Highs 66 to 81.

Tonight 9 Sep Southern Clearwater Mountains

Mostly clear. Lows 38 to 53.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Crystal Lake Temperature Statistics

September Temperature

Grangeville - Idaho County Airport (30.4 miles)

  • Lowest 5 September, 2026

    41 °F

  • Average September

    54.8 °F

  • Highest 1 September, 2026

    82.4 °F

Climate (2021–2026)

Grangeville - Idaho County Airport (30.4 miles)

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  • Average Low 2021–2026

    37 °F

  • Average 2021–2026

    47.3 °F

  • Average High 2021–2026

    57.9 °F
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