Keep Cool Lakes Weather Forecast

    • 50
    • 76

    Slight Chance Thunderstorms

    • 45
    • 76

    Partly Sunny

    • 46
    • 78

    Mostly Sunny

    • 49
    • 84

    Mostly Sunny

    • 51
    • 86

    Partly Sunny

    • 48
    • 82

    Chance Rain Showers

Today 17 Aug Upper Blackfoot and MacDonald Pass

Partly sunny. Slight chance of rain Showers early in the afternoon. Slight chance of Thunderstorms late in the afternoon. Highs 69 to 77. Southwest Winds up to 5 Mph shifting to the west 5 to 15 Mph in the afternoon. Chance of precipitation 20 percent.

Tonight 17 Aug Upper Blackfoot and MacDonald Pass

Mostly cloudy. Lows 51 to 57. West Winds up to 10 Mph. Gusts up to 25 Mph in the evening.

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Keep Cool Lakes Temperature Statistics

August Temperature

Helena Regional Airport (39.8 miles)

  • Lowest 4 August, 2026

    45.6 °F

  • Average August

    69.8 °F

  • Highest 1 August, 2026

    103.6 °F

Climate (2021–2026)

Helena Regional Airport (39.8 miles)

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  • Average Low 2021–2026

    36.3 °F

  • Average 2021–2026

    47.9 °F

  • Average High 2021–2026

    59.8 °F
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