Simms Weather Forecast

    • 44
    • 64

    Decreasing Clouds

    • 42
    • 62

    Partly Sunny

    • 51
    • 73

    Rain Showers Likely

    • 51
    • 72

    Chance Rain

    • 49
    • 71

    Mostly Sunny

    • 49
    • 74

    Mostly Sunny

    • 49
    • 77

    Mostly Sunny

Today 15 Sep Cascade County below 5000ft

Partly cloudy. Lows around 50. Highs in the lower 70s.

Tonight 15 Sep Cascade County below 5000ft

Mostly cloudy. A 20 percent chance of rain in the evening. Patchy fog early in the morning. Lows in the lower 40s. Northeast Winds 5 to 15 Mph shifting to the northwest after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Simms Temperature Statistics

September Temperature

Great Falls, Great Falls International Airport (25.5 miles)

  • Lowest 13 September, 2026

    42.1 °F

  • Average September

    60.6 °F

  • Highest 1 September, 2026

    86.6 °F

Climate (2021–2026)

Great Falls, Great Falls International Airport (25.5 miles)

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  • Average Low 2021–2026

    34.3 °F

  • Average 2021–2026

    46.9 °F

  • Average High 2021–2026

    59.1 °F
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