Neff Reservoir Weather Forecast

    • 46
    • 74

    Becoming Sunny

    • 45
    • 72

    Mostly Sunny

    • 43
    • 71

    Mostly Sunny

    • 47
    • 77

    Mostly Sunny

    • 44
    • 70

    Mostly Sunny

    • 47
    • 74

    Mostly Sunny

Today 29 Sep Natrona County Lower Elevations

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

Tonight 29 Sep Natrona County Lower Elevations

Mostly clear. Lows in the mid 40s.

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Neff Reservoir Temperature Statistics

September Temperature

Casper, Natrona County International Airport (37.3 miles)

  • Lowest 9 September, 2026

    36.6 °F

  • Average September

    64.3 °F

  • Highest 5 September, 2026

    91.7 °F

Climate (2021–2026)

Casper, Natrona County International Airport (37.3 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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