Rattlesnake Reservoir Weather Forecast

    • 60
    • 88

    Chance Thunderstorms

    • 59
    • 83

    Rain Showers Likely

    • 58
    • 80

    Chance Thunderstorms

    • 61
    • 90

    Mostly Sunny

    • 61
    • 94

    Mostly Sunny

    • 60
    • 94

    Partly Sunny

    • 61
    • 93

    Partly Sunny

Today 21 Jul Southwestern Yellowstone

Mostly sunny. Slight chance of Showers and Thunderstorms early in the Afternoon, then chance of Showers and Thunderstorms late in the afternoon. Highs in the upper 80s. Northeast Winds 10 to 20 Mph. Chance of precipitation 30 percent.

Tonight 21 Jul Southwestern Yellowstone

Mostly cloudy. A 40 percent chance of Showers and Thunderstorms in the evening. Lows in the lower 60s. North Winds 5 to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Rattlesnake Reservoir Temperature Statistics

July Temperature

Billings, Billings Logan International Airport (8.1 miles)

  • Lowest 16 July, 2025

    51.7 °F

  • Average July

    73.3 °F

  • Highest 9 July, 2025

    99.6 °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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