Great Falls Weather Forecast

    • 53
    • 84

    Slight Chance Thunderstorms

    • 55
    • 87

    Mostly Sunny

    • 55
    • 85

    Mostly Sunny

    • 59
    • 87

    Partly Sunny

    • 57
    • 89

    Chance Rain Showers

    • 54
    • 85

    Mostly Sunny

Today 18 Aug Cascade County below 5000ft

Mostly sunny. Patchy smoke through the day. A 20 percent chance of Thunderstorms in the afternoon. Highs in the lower 80s. West Winds up to 10 Mph.

Tonight 18 Aug Cascade County below 5000ft

Partly cloudy. A 20 percent chance of Thunderstorms in the evening. Patchy smoke through the night. Lows in the mid 50s. Southwest Winds up to 10 Mph.

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Great Falls Temperature Statistics

August Temperature

Great Falls, Great Falls International Airport (3.7 miles)

  • Lowest 4 August, 2026

    38.6 °F

  • Average August

    65.3 °F

  • Highest 1 August, 2026

    102.7 °F

Climate (2021–2026)

Great Falls, Great Falls International Airport (3.7 miles)

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  • Average Low 2021–2026

    34.3 °F

  • Average 2021–2026

    46.8 °F

  • Average High 2021–2026

    59 °F
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