Casper Mountain County Park Weather Forecast

    • 51
    • 56

    Rain Showers

    • 49
    • 66

    Rain Showers Likely

    • 44
    • 60

    Rain Showers Likely

    • 42
    • 52

    Chance Rain Showers

    • 46
    • 61

    Mostly Sunny

    • 48
    • 66

    Mostly Sunny

Today 17 Sep Casper Mountain

A slight chance of Thunderstorms. Showers. Highs in the lower 60s. South Winds around 10 Mph with Gusts up to 20 Mph. Chance of rain 80 percent.

Tonight 17 Sep Casper Mountain

Mostly cloudy in the Evening, then becoming partly cloudy. Lows around 50. Southwest Winds 10 to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Casper Mountain County Park Temperature Statistics

September Temperature

Casper, Natrona County International Airport (13.7 miles)

  • Lowest 9 September, 2026

    36.6 °F

  • Average September

    66.4 °F

  • Highest 5 September, 2026

    91.7 °F

Climate (2021–2026)

Casper, Natrona County International Airport (13.7 miles)

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  • Average Low 2021–2026

    33.3 °F

  • Average 2021–2026

    47.7 °F

  • Average High 2021–2026

    61.6 °F
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