Lewistown Municipal Airport Weather Forecast

    • 54
    • 81

    Increasing Clouds

    • 58
    • 85

    Slight Chance Thunderstorms

    • 59
    • 91

    Mostly Sunny

    • 56
    • 88

    Partly Sunny

    • 50
    • 78

    Partly Sunny

    • 48
    • 72

    Mostly Sunny

Today 17 Aug Fergus County below 4500ft

Not as warm. Partly cloudy. A 20 percent chance of rain Showers in the afternoon. Highs 80 to 85. Northwest Winds up to 10 Mph.

Tonight 17 Aug Fergus County below 4500ft

Mostly cloudy. A 40 percent chance of Thunderstorms in the evening. Haze through the night. Lows 55 to 60. Southwest Winds up to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lewistown Municipal Airport Temperature Statistics

August Temperature

Lewistown, Lewistown Municipal Airport (0 miles)

  • Lowest 10 August, 2025

    47.6 °F

  • Average August

    66 °F

  • Highest 13 August, 2025

    92.6 °F

Climate (2020–Present)

Lewistown, Lewistown Municipal Airport (0 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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