Roundup Weather Forecast

    • 61
    • 87

    Increasing Clouds

    • 64
    • 91

    Partly Sunny

    • 63
    • 91

    Chance Rain Showers

    • 66
    • 100

    Slight Chance Thunderstorms

    • 66
    • 101

    Hot

    • 64
    • 97

    Hot

Today 21 Jul Musselshell

Mostly sunny. Highs in the mid 80s. East Winds 5 to 15 Mph.

Tonight 21 Jul Musselshell

Mostly cloudy. Lows in the lower 60s. Northeast Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Roundup Temperature Statistics

July Temperature

N BAR Ranch Airport (32.9 miles)

  • Lowest 1 July, 2026

    44.6 °F

  • Average July

    70.6 °F

  • Highest 12 July, 2026

    104 °F

Climate (2021–2026)

N BAR Ranch Airport (32.9 miles)

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  • Average Low 2021–2026

    31.9 °F

  • Average 2021–2026

    44 °F

  • Average High 2021–2026

    55.3 °F
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