Great Falls Weather Forecast

    • 55
    • 93

    Slight Chance Thunderstorms

    • 52
    • 82

    Mostly Sunny

    • 50
    • 78

    Mostly Sunny

    • 51
    • 83

    Mostly Sunny

    • 54
    • 85

    Mostly Sunny

    • 54
    • 87

    Mostly Sunny

Today 20 Aug Cascade County below 5000ft

Sunny. A 20 percent chance of Thunderstorms in the afternoon. Highs 90 to 95. West Winds up to 10 Mph.

Tonight 20 Aug Cascade County below 5000ft

Cooler. Partly cloudy. A 20 percent chance of Thunderstorms in the evening. Lows 50 to 55. West Winds 5 to 15 Mph.

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Great Falls Temperature Statistics

August Temperature

Great Falls, Great Falls International Airport (3.7 miles)

  • Lowest 15 August, 2025

    47.6 °F

  • Average August

    68.9 °F

  • Highest 13 August, 2025

    94.6 °F

Climate (2020–Present)

Great Falls, Great Falls International Airport (3.7 miles)

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  • Average Low 2020–2025

    33.9 °F

  • Average 2020–2025

    46.4 °F

  • Average High 2020–2025

    58.3 °F
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