Lewistown Weather Forecast

    • 40
    • 58

    Rain Showers

    • 43
    • 68

    Becoming Sunny

    • 45
    • 70

    Slight Chance Thunderstorms

    • 45
    • 72

    Rain Showers Likely

    • 48
    • 78

    Rain Showers Likely

    • 43
    • 67

    Rain Showers

    • 41
    • 59

    Rain Showers Likely

Today 22 Jun Fergus County below 4500ft

Mostly cloudy. Chance of Thunderstorms early in the Afternoon, then slight chance of Thunderstorms late in the afternoon. Highs in the mid 60s. North Winds 5 to 10 Mph. Chance of Thunderstorms 50 percent.

Tonight 22 Jun Fergus County below 4500ft

Mostly cloudy early in the evening then clearing. A 20 percent chance of Thunderstorms early in the evening. Lows 42 to 48. West Winds 5 to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lewistown Temperature Statistics

June Temperature

Lewistown, Lewistown Municipal Airport (1.2 miles)

  • Lowest 14 June, 2026

    36.6 °F

  • Average June

    53.5 °F

  • Highest 5 June, 2026

    78.7 °F

Climate (2021–2026)

Lewistown, Lewistown Municipal Airport (1.2 miles)

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  • Average Low 2021–2026

    32.6 °F

  • Average 2021–2026

    44.9 °F

  • Average High 2021–2026

    57 °F
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