Lewistown Weather Forecast

    • 18
    • 49

    Chance Rain

    • 31
    • 42

    Chance Rain/Snow

    • 19
    • 47

    Chance Rain/Snow

    • 22
    • 37

    Partly Sunny

    • 25
    • 41

    Slight Chance Rain/Snow

    • 23
    • 43

    Slight Chance Rain/Snow

Today 17 Dec Fergus County below 4500ft

Strong Winds. Mostly cloudy late in the morning then becoming mostly sunny. Chance of rain late in the morning. Slight chance of snow late in the afternoon. Patchy blowing dust through the day. Highs in the upper 40s. West Winds 25 to 35 Mph with Gusts to around 60 Mph increasing to 30 to 50 Mph with Gusts to around 70 Mph in the afternoon. Chance of precipitation 50 percent.

Tonight 17 Dec Fergus County below 4500ft

Very windy. Colder. Partly cloudy. Patchy blowing dust in the evening. Lows around 18. West Winds 30 to 45 Mph with Gusts to around 75 Mph decreasing to 15 to 25 Mph with Gusts to around 60 Mph after midnight.

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Lewistown Temperature Statistics

December Temperature

Lewistown, Lewistown Municipal Airport (1.2 miles)

  • Lowest 12 December, 2025

    1 °F

  • Average December

    29.7 °F

  • Highest 15 December, 2025

    55.9 °F

Climate (2020–Present)

Lewistown, Lewistown Municipal Airport (1.2 miles)

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  • Average Low 2020–2025

    32.4 °F

  • Average 2020–2025

    44.6 °F

  • Average High 2020–2025

    56.5 °F
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