Lewistown Weather Forecast

    • 49
    • 78

    Rain Showers

    • 49
    • 74

    Chance Rain Showers

    • 48
    • 72

    Chance Rain Showers

    • 50
    • 78

    Mostly Sunny

    • 51
    • 81

    Chance Thunderstorms

    • 46
    • 77

    Chance Rain Showers

Today 15 Jun Fergus County below 4500ft

Mostly cloudy. Patchy fog in the morning. Slight chance of rain Showers in the Morning, then chance of Thunderstorms in the afternoon. Highs 75 to 80. Southeast Winds up to 5 Mph shifting to the east in the afternoon. Chance of precipitation 50 percent.

Tonight 15 Jun Fergus County below 4500ft

Cooler. Mostly cloudy. Thunderstorms likely in the evening. Some Thunderstorms may be severe. Lows 50 to 55. Southwest Winds up to 10 Mph. Chance of Thunderstorms 70 percent.

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Lewistown Temperature Statistics

June Temperature

Lewistown, Lewistown Municipal Airport (1.2 miles)

  • Lowest 3 June, 2025

    32.6 °F

  • Average June

    56.4 °F

  • Highest 9 June, 2025

    86.6 °F

Climate (2020–Present)

Lewistown, Lewistown Municipal Airport (1.2 miles)

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  • Average Low 2020–2025

    32.2 °F

  • Average 2020–2025

    44.4 °F

  • Average High 2020–2025

    56.3 °F
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