Granite State Park Weather Forecast

    • 33
    • 52

    Becoming Sunny

    • 38
    • 54

    Partly Sunny

    • 33
    • 51

    Partly Sunny

    • 38
    • 57

    Partly Sunny

    • 38
    • 58

    Partly Sunny

    • 34
    • 53

    Mostly Sunny

Today 28 Sep Butte/Blackfoot Region

Partly cloudy. Highs in the 60s.

Tonight 28 Sep Butte/Blackfoot Region

Mostly clear. Lows in the 30s. West Winds to 15 Mph.

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Granite State Park Temperature Statistics

September Temperature

Butte, Bert Mooney Airport (43.5 miles)

  • Lowest 15 September, 2026

    27.6 °F

  • Average September

    55.5 °F

  • Highest 25 September, 2026

    80.7 °F

Climate (2021–2026)

Butte, Bert Mooney Airport (43.5 miles)

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  • Average Low 2021–2026

    28.5 °F

  • Average 2021–2026

    42.3 °F

  • Average High 2021–2026

    55.7 °F
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