Herrin Lakes Weather Forecast

    • 46
    • 67

    Rain Showers

    • 46
    • 73

    Rain Showers Likely

    • 46
    • 73

    Rain Showers

    • 32
    • 61

    Rain Showers

    • 33
    • 65

    Partly Sunny

    • 37
    • 72

    Mostly Sunny

    • 39
    • 74

    Partly Sunny

Today 4 Sep Upper Blackfoot and MacDonald Pass

Mostly sunny. Slight chance of rain Showers early in the Afternoon, then slight chance of Thunderstorms late in the afternoon. Highs 60 to 68. West Winds 5 to 10 Mph. Chance of precipitation 20 percent.

Tonight 4 Sep Upper Blackfoot and MacDonald Pass

Mostly cloudy. Chance of rain Showers and slight chance of Thunderstorms in the Evening, then chance of rain Showers after midnight. Lows in the mid 40s. West Winds up to 10 Mph shifting to the north after midnight. Chance of precipitation 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Herrin Lakes Temperature Statistics

September Temperature

Helena Regional Airport (39.8 miles)

  • Lowest 1 September, 2026

    48.7 °F

  • Average September

    64 °F

  • Highest 1 September, 2026

    85.6 °F

Climate (2021–2026)

Helena Regional Airport (39.8 miles)

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  • Average Low 2021–2026

    36.4 °F

  • Average 2021–2026

    48 °F

  • Average High 2021–2026

    60 °F
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