Hump Lake Weather Forecast

    • 41
    • 58

    Partly Sunny

    • 45
    • 57

    Partly Sunny

    • 46
    • 64

    Partly Sunny

    • 34
    • 51

    Slight Chance Rain/Snow

    • 34
    • 45

    Mostly Cloudy

Today 22 Sep Southern Clearwater Mountains

Partly cloudy. Highs 64 to 79.

Tonight 22 Sep Southern Clearwater Mountains

Partly cloudy. Lows in the upper 30s to lower 50s.

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Hump Lake Temperature Statistics

September Temperature

Grangeville - Idaho County Airport (31.1 miles)

  • Lowest 15 September, 2026

    37.4 °F

  • Average September

    56 °F

  • Highest 10 September, 2026

    84.2 °F

Climate (2021–2026)

Grangeville - Idaho County Airport (31.1 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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