Granite State Park Weather Forecast

    • 41
    • 62

    Mostly Sunny

    • 41
    • 60

    Partly Sunny

    • 41
    • 61

    Mostly Sunny

    • 45
    • 65

    Partly Sunny

    • 35
    • 60

    Partly Sunny

    • 31
    • 47

    Partly Sunny

Today 21 Sep Butte/Blackfoot Region

Sunny. Patchy fog early in the morning. Highs in the upper 60s to mid 70s.

Tonight 21 Sep Butte/Blackfoot Region

Mostly clear. Lows in the upper 30s to mid 40s.

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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

    55.2 °F

  • Highest 1 September, 2026

    79.6 °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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