Great Falls International Airport Weather Forecast

    • 59
    • 89

    Slight Chance Thunderstorms

    • 60
    • 96

    Mostly Sunny

    • 56
    • 92

    Partly Sunny

    • 53
    • 82

    Mostly Sunny

    • 52
    • 80

    Mostly Sunny

    • 54
    • 84

    Mostly Sunny

    • 56
    • 88

    Mostly Sunny

Today 18 Aug Cascade County below 5000ft

Partly cloudy late in the morning then clearing. Highs 85 to 90. Southwest Winds up to 10 Mph.

Tonight 18 Aug Cascade County below 5000ft

Mostly clear. A 20 percent chance of Thunderstorms in the evening. Lows 55 to 60. South Winds up to 10 Mph.

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Great Falls International Airport Temperature Statistics

August Temperature

Great Falls, Great Falls International Airport (0.6 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 (0.6 miles)

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  • Average Low 2020–2025

    34 °F

  • Average 2020–2025

    46.4 °F

  • Average High 2020–2025

    58.3 °F
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