Gibson Reservoir Weather Forecast

    • 45
    • 75

    Increasing Clouds

    • 44
    • 76

    Partly Sunny

    • 48
    • 76

    Mostly Sunny

    • 39
    • 64

    Slight Chance Rain

    • 41
    • 65

    Mostly Sunny

    • 44
    • 74

    Mostly Sunny

Today 18 Sep Southern Rocky Mountain Front

Sunny. Highs 65 to 75. Northwest Winds up to 10 Mph.

Tonight 18 Sep Southern Rocky Mountain Front

Mostly clear. Lows 45 to 50. Northeast Winds up to 10 Mph shifting to the southwest after midnight.

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Gibson Reservoir Temperature Statistics

September Temperature

Great Falls, Great Falls International Airport (66.5 miles)

  • Lowest 5 September, 2025

    39.9 °F

  • Average September

    64.6 °F

  • Highest 1 September, 2025

    90 °F

Climate (2020–Present)

Great Falls, Great Falls International Airport (66.5 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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