Rock Spring Reservoir Weather Forecast

    • 45
    • 72

    Mostly Sunny

    • 48
    • 75

    Partly Sunny

    • 50
    • 78

    Mostly Sunny

    • 46
    • 78

    Mostly Sunny

    • 41
    • 64

    Slight Chance Thunderstorms

    • 44
    • 72

    Mostly Sunny

Today 18 Sep Natrona County Lower Elevations

Mostly sunny. Highs around 70. West Winds around 10 Mph.

Tonight 18 Sep Natrona County Lower Elevations

Partly cloudy. Lows in the lower 40s.

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Rock Spring Reservoir Temperature Statistics

September Temperature

Casper, Natrona County International Airport (34.8 miles)

  • Lowest 6 September, 2025

    37.9 °F

  • Average September

    65.5 °F

  • Highest 10 September, 2025

    90 °F

Climate (2020–Present)

Casper, Natrona County International Airport (34.8 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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