Steamboat Lake Weather Forecast

    • 36
    • 64

    Slight Chance Thunderstorms

    • 37
    • 68

    Mostly Sunny

    • 42
    • 75

    Slight Chance Thunderstorms

    • 41
    • 73

    Mostly Sunny

    • 44
    • 76

    Partly Sunny

    • 44
    • 79

    Mostly Sunny

    • 42
    • 76

    Mostly Sunny

Today 20 Sep Green Mountains and Rattlesnake Range

Partly cloudy with a chance of Showers with a slight chance of Thunderstorms. Highs around 60. Northwest Winds around 10 Mph with Gusts up to 30 Mph. Chance of rain 30 percent.

Tonight 20 Sep Green Mountains and Rattlesnake Range

Partly cloudy. Lows in the upper 30s. North Winds around 10 Mph with Gusts up to 20 Mph in the evening.

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Steamboat Lake Temperature Statistics

September Temperature

Casper, Natrona County International Airport (38.5 miles)

  • Lowest 9 September, 2026

    36.6 °F

  • Average September

    65.7 °F

  • Highest 5 September, 2026

    91.7 °F

Climate (2021–2026)

Casper, Natrona County International Airport (38.5 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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