Great Falls Weather Forecast

    • 45
    • 74

    Rain Showers

    • 42
    • 65

    Mostly Sunny

    • 42
    • 61

    Partly Sunny

    • 46
    • 71

    Mostly Sunny

    • 47
    • 74

    Partly Sunny

    • 53
    • 66

    Mostly Cloudy

Today 31 Jan Chester

Partly sunny. Showers likely in the afternoon. Highs in the lower 70s. South Winds 5 to 10 Mph with Gusts up to 30 Mph. Chance of rain 70 percent.

Tonight 31 Jan Chester

Cloudy with Showers in the Evening, then partly cloudy with a chance of Showers after midnight. Lows in the lower 40s. Southwest Winds 5 to 10 Mph. Gusts up to 25 Mph in the evening. Chance of rain 90 percent.

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Great Falls Temperature Statistics

January Temperature

Lancaster County-mc Whirter Field (10.6 miles)

  • Lowest 23 January, 2025

    14 °F

  • Average January

    36.1 °F

  • Highest 19 January, 2025

    60.8 °F

Climate (2020–Present)

Lancaster County-mc Whirter Field (10.6 miles)

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  • Average Low 2020–2025

    51.9 °F

  • Average 2020–2025

    62.1 °F

  • Average High 2020–2025

    73.5 °F
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