Gregg Lake Weather Forecast

    • 43
    • 69

    Slight Chance Rain Showers

    • 47
    • 73

    Partly Sunny

    • 49
    • 81

    Partly Sunny

    • 52
    • 85

    Mostly Sunny

    • 44
    • 73

    Mostly Sunny

    • 44
    • 73

    Mostly Sunny

    • 47
    • 78

    Mostly Sunny

Today 18 Sep Box Butte

Mostly sunny. A slight chance of Showers late this morning. Highs in the upper 60s. North Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 18 Sep Box Butte

Mostly clear this Evening, then becoming partly cloudy. A slight chance of Showers after midnight. Patchy fog after midnight. Lows in the mid 40s. North Winds 5 to 10 Mph, becoming southeast after midnight. Chance of rain 20 percent.

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Gregg Lake Temperature Statistics

September Temperature

Chadron, Chadron Municipal Airport (29.2 miles)

  • Lowest 6 September, 2025

    30.9 °F

  • Average September

    65.4 °F

  • Highest 11 September, 2025

    93 °F

Climate (2020–Present)

Chadron, Chadron Municipal Airport (29.2 miles)

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  • Average Low 2020–2025

    35.3 °F

  • Average 2020–2025

    49.4 °F

  • Average High 2020–2025

    63.6 °F
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