Herrin Lakes Weather Forecast

    • 47
    • 88

    Increasing Clouds

    • 46
    • 78

    Chance Thunderstorms

    • 50
    • 84

    Mostly Sunny

    • 50
    • 91

    Partly Sunny

    • 46
    • 87

    Mostly Sunny

    • 44
    • 82

    Mostly Sunny

    • 42
    • 78

    Mostly Sunny

Today 16 Aug Upper Blackfoot and MacDonald Pass

Sunny. Haze and Areas of smoke through the day. A 20 percent chance of Thunderstorms in the afternoon. Highs 75 to 85. Southwest Winds 5 to 15 Mph.

Tonight 16 Aug Upper Blackfoot and MacDonald Pass

Mostly cloudy. A 30 percent chance of Thunderstorms in the evening. Haze through the night. Areas of smoke after midnight. Lows 50 to 55. West Winds up to 10 Mph.

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Herrin Lakes Temperature Statistics

August Temperature

Helena Regional Airport (39.8 miles)

  • Lowest 7 August, 2025

    49.6 °F

  • Average August

    69.7 °F

  • Highest 12 August, 2025

    95.6 °F

Climate (2020–Present)

Helena Regional Airport (39.8 miles)

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  • Average Low 2020–2025

    36 °F

  • Average 2020–2025

    47.5 °F

  • Average High 2020–2025

    59.4 °F
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