Casper Mountain Weather Forecast

    • 40
    • 53

    Rain Showers

    • 44
    • 47

    Rain Showers

    • 43
    • 53

    Isolated Thunderstorms

    • 47
    • 60

    Partly Sunny

    • 49
    • 64

    Partly Sunny

    • 47
    • 61

    Mostly Sunny

Today 16 Sep Casper Mountain

Mostly cloudy with numerous Showers. Isolated Thunderstorms this Morning, then scattered Thunderstorms this afternoon. Highs in the upper 50s. Southwest Winds around 10 Mph, becoming north this afternoon. Gusts up to 25 Mph. Chance of rain 60 percent.

Tonight 16 Sep Casper Mountain

Mostly cloudy. Numerous Showers and scattered Thunderstorms in the Evening, then scattered Showers with isolated Thunderstorms after midnight. Patchy fog after midnight. Lows in the lower 40s. East Winds around 10 Mph with Gusts up to 20 Mph in the evening. Chance of rain 60 percent.

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Casper Mountain Temperature Statistics

September Temperature

Casper, Natrona County International Airport (13 miles)

  • Lowest 6 September, 2025

    37.9 °F

  • Average September

    65.8 °F

  • Highest 10 September, 2025

    90 °F

Climate (2020–Present)

Casper, Natrona County International Airport (13 miles)

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  • Average Low 2020–2025

    32.6 °F

  • Average 2020–2025

    46.7 °F

  • Average High 2020–2025

    60.3 °F
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