Rattlesnake Reservoir Weather Forecast

    • 48
    • 80

    Partly Cloudy

    • 58
    • 88

    Mostly Cloudy

    • 55
    • 88

    Partly Sunny

    • 55
    • 85

    Mostly Cloudy

    • 56
    • 84

    Chance Rain Showers

    • 54
    • 79

    Chance Rain Showers

Today 6 Sep Southwestern Yellowstone

Sunny, warmer. Highs around 80. Southeast Winds 5 to 10 Mph.

Tonight 6 Sep Southwestern Yellowstone

Partly cloudy. Lows in the upper 40s. North Winds 5 to 10 Mph.

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Rattlesnake Reservoir Temperature Statistics

September Temperature

Billings, Billings Logan International Airport (8.1 miles)

  • Lowest 3 September, 2025

    53.1 °F

  • Average September

    70.2 °F

  • Highest 2 September, 2025

    91 °F

Climate (2020–Present)

Billings, Billings Logan International Airport (8.1 miles)

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  • Average Low 2020–2025

    38.5 °F

  • Average 2020–2025

    49.3 °F

  • Average High 2020–2025

    60.5 °F
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