Rock Spring Reservoir Weather Forecast

    • 48
    • 76

    Increasing Clouds

    • 51
    • 68

    Rain Showers

    • 50
    • 78

    Rain Showers Likely

    • 45
    • 71

    Chance Rain Showers

    • 44
    • 69

    Slight Chance Thunderstorms

    • 45
    • 74

    Mostly Sunny

Today 16 Sep Natrona County Lower Elevations

Mostly cloudy with scattered Showers this Morning, then partly cloudy this afternoon. Highs around 80. Southwest Winds 10 to 15 Mph with Gusts up to 30 Mph. Chance of rain 30 percent.

Tonight 16 Sep Natrona County Lower Elevations

Partly cloudy in the Evening, then becoming cloudy. Lows in the upper 40s. North Winds 10 to 15 Mph with Gusts up to 30 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Rock Spring Reservoir Temperature Statistics

September Temperature

Casper, Natrona County International Airport (34.8 miles)

  • Lowest 9 September, 2026

    36.6 °F

  • Average September

    67.1 °F

  • Highest 5 September, 2026

    91.7 °F

Climate (2021–2026)

Casper, Natrona County International Airport (34.8 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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