Lewistown Weather Forecast

    • 44
    • 72

    Rain Showers Likely

    • 37
    • 59

    Rain Showers Likely

    • 49
    • 80

    Partly Sunny

    • 40
    • 71

    Mostly Sunny

    • 48
    • 76

    Mostly Sunny

    • 46
    • 79

    Partly Sunny

Today 8 May Fergus County below 4500ft

Mostly sunny. Highs in the mid 70s. West Winds up to 10 Mph shifting to the northwest with Gusts to around 30 Mph in the afternoon.

Tonight 8 May Fergus County below 4500ft

Cloudy. Slight chance of Thunderstorms in the Evening, then chance of rain Showers after midnight. Lows in the upper 40s. Northwest Winds 5 to 15 Mph with Gusts to around 30 Mph. Chance of precipitation 50 percent.

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Lewistown Temperature Statistics

May Temperature

Lewistown, Lewistown Municipal Airport (1.2 miles)

  • Lowest 1 May, 2026

    30.7 °F

  • Average May

    49.4 °F

  • Highest 3 May, 2026

    71.7 °F

Climate (2021–Present)

Lewistown, Lewistown Municipal Airport (1.2 miles)

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  • Average Low 2021–2026

    32.7 °F

  • Average 2021–2026

    45 °F

  • Average High 2021–2026

    57.2 °F
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