Grangeville Weather Forecast

    • 48
    • 72

    Becoming Sunny

    • 47
    • 70

    Partly Sunny

    • 51
    • 81

    Mostly Sunny

    • 40
    • 67

    Rain Likely

    • 39
    • 56

    Mostly Cloudy

    • 40
    • 59

    Chance Rain

    • 40
    • 59

    Partly Sunny

Today 22 Sep Orofino/Grangeville Region

Partly cloudy. Highs in the 60s to lower 70s.

Tonight 22 Sep Orofino/Grangeville Region

Mostly cloudy early in the evening then clearing. Lows in the mid 40s to lower 50s.

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Grangeville Temperature Statistics

September Temperature

Grangeville - Idaho County Airport (0.6 miles)

  • Lowest 15 September, 2026

    37.4 °F

  • Average September

    56.2 °F

  • Highest 10 September, 2026

    84.2 °F

Climate (2021–2026)

Grangeville - Idaho County Airport (0.6 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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