Ackley Lake State Park Weather Forecast

    • 50
    • 76

    Increasing Clouds

    • 48
    • 73

    Rain

    • 44
    • 63

    Rain

    • 45
    • 71

    Mostly Sunny

    • 47
    • 77

    Mostly Sunny

    • 46
    • 78

    Mostly Sunny

Today 17 Sep Judith Basin County and Judith Gap

Warmer. Sunny until late afternoon then becoming partly sunny. Highs in the mid 70s. Southeast Winds 5 to 15 Mph with Gusts to around 30 Mph.

Tonight 17 Sep Judith Basin County and Judith Gap

Mostly cloudy in the evening then becoming partly cloudy. Lows around 50. South Winds 5 to 15 Mph shifting to the southwest after midnight.

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Ackley Lake State Park Temperature Statistics

September Temperature

Lewistown, Lewistown Municipal Airport (22.4 miles)

  • Lowest 9 September, 2026

    39.7 °F

  • Average September

    62.7 °F

  • Highest 2 September, 2026

    87.7 °F

Climate (2021–2026)

Lewistown, Lewistown Municipal Airport (22.4 miles)

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  • Average Low 2021–2026

    32.5 °F

  • Average 2021–2026

    44.9 °F

  • Average High 2021–2026

    57 °F
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