Decker Weather Forecast

    • 45
    • 71

    Mostly Sunny

    • 48
    • 79

    Chance Rain Showers

    • 44
    • 79

    Mostly Sunny

    • 50
    • 83

    Mostly Sunny

    • 48
    • 83

    Mostly Sunny

    • 42
    • 77

    Partly Sunny

    • 43
    • 75

    Chance Rain Showers

Today 21 Sep Southern Big Horn

Mostly cloudy with a 20 percent chance of rain Showers in the Morning, then mostly sunny in the afternoon. Highs in the lower 70s.

Tonight 21 Sep Southern Big Horn

Mostly clear. Lows in the upper 40s. Southeast Winds 5 to 15 Mph.

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Decker Temperature Statistics

September Temperature

Sheridan County Airport (18 miles)

  • Lowest 15 September, 2026

    36.6 °F

  • Average September

    64.3 °F

  • Highest 4 September, 2026

    97.6 °F

Climate (2021–2026)

Sheridan County Airport (18 miles)

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  • Average Low 2021–2026

    33.4 °F

  • Average 2021–2026

    47.6 °F

  • Average High 2021–2026

    62.2 °F
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