Chessman Reservoir Weather Forecast

    • 48
    • 64

    Rain Showers Likely

    • 45
    • 66

    Rain Showers Likely

    • 48
    • 70

    Chance Rain Showers

    • 51
    • 78

    Mostly Sunny

    • 51
    • 79

    Mostly Sunny

    • 49
    • 78

    Slight Chance Thunderstorms

    • 50
    • 77

    Partly Sunny

Today 21 Jul Upper Blackfoot and MacDonald Pass

Mostly cloudy. Slight chance of rain Showers late in the Morning, then rain Showers likely and chance of Thunderstorms in the afternoon. Highs 60 to 70. Northeast Winds 5 to 15 Mph. Chance of precipitation 70 percent.

Tonight 21 Jul Upper Blackfoot and MacDonald Pass

Cooler. Mostly cloudy. Rain Showers likely and chance of Thunderstorms in the Evening, then chance of rain Showers after midnight. Lows 45 to 55. Northeast Winds 5 to 15 Mph shifting to the west after midnight. Chance of precipitation 70 percent.

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Chessman Reservoir Temperature Statistics

July Temperature

Helena Regional Airport (13 miles)

  • Lowest 5 July, 2025

    49.6 °F

  • Average July

    71.9 °F

  • Highest 8 July, 2025

    97.6 °F

Climate (2020–Present)

Helena Regional Airport (13 miles)

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  • Average Low 2020–2025

    36.1 °F

  • Average 2020–2025

    47.5 °F

  • Average High 2020–2025

    59.4 °F
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