Park Lake Weather Forecast

    • 41
    • 56

    Rain Likely

    • 41
    • 61

    Chance Rain

    • 43
    • 67

    Sunny

    • 43
    • 70

    Mostly Sunny

    • 43
    • 67

    Partly Sunny

    • 44
    • 68

    Slight Chance Rain Showers

Today 15 Sep Elkhorn and Boulder Mountains

Cooler. Mostly cloudy with a 50 percent chance of rain Showers. Highs 50 to 60. Northwest Winds 5 to 10 Mph.

Tonight 15 Sep Elkhorn and Boulder Mountains

Mostly cloudy. Chance of Thunderstorms in the Evening, then chance of rain Showers after midnight. Lows 40 to 45. Northwest Winds up to 10 Mph. Chance of precipitation 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Park Lake Temperature Statistics

September Temperature

Helena Regional Airport (13.7 miles)

  • Lowest 5 September, 2025

    46 °F

  • Average September

    66.4 °F

  • Highest 3 September, 2025

    91.9 °F

Climate (2020–Present)

Helena Regional Airport (13.7 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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