Deerfield Lake Weather Forecast

    • 41
    • 64

    Partly Sunny

    • 50
    • 63

    Chance Thunderstorms

    • 38
    • 66

    Mostly Sunny

    • 44
    • 63

    Chance Rain Showers

    • 42
    • 68

    Mostly Sunny

    • 45
    • 69

    Slight Chance Thunderstorms

Today 12 Sep Northern Black Hills

Partly cloudy. Highs in the mid 60s. South Winds 5 to 10 Mph. Gusts up to 20 Mph this afternoon.

Tonight 12 Sep Northern Black Hills

Partly cloudy. Lows in the lower 40s. Southeast Winds 5 to 10 Mph with Gusts up to 20 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Deerfield Lake Temperature Statistics

September Temperature

Custer, Custer County Airport (21.1 miles)

  • Lowest 10 September, 2026

    43 °F

  • Average September

    66.8 °F

  • Highest 4 September, 2026

    86.6 °F

Climate (2021–2026)

Custer, Custer County Airport (21.1 miles)

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  • Average Low 2021–2026

    33.6 °F

  • Average 2021–2026

    45.4 °F

  • Average High 2021–2026

    57 °F
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