Heart Lake Weather Forecast

    • 50
    • 70

    Decreasing Clouds

    • 55
    • 75

    Partly Sunny

    • 54
    • 83

    Mostly Sunny

    • 50
    • 79

    Mostly Sunny

    • 45
    • 73

    Mostly Sunny

    • 46
    • 70

    Mostly Sunny

Today 17 Aug Southern Rocky Mountain Front

Mostly cloudy. A 20 percent chance of Thunderstorms in the afternoon. Highs 65 to 75. West Winds 5 to 15 Mph.

Tonight 17 Aug Southern Rocky Mountain Front

Mostly cloudy in the evening then clearing. Lows 45 to 55. Southwest Winds up to 10 Mph.

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Heart Lake Temperature Statistics

August Temperature

Helena Regional Airport (47.8 miles)

  • Lowest 7 August, 2025

    49.6 °F

  • Average August

    70 °F

  • Highest 12 August, 2025

    95.6 °F

Climate (2020–Present)

Helena Regional Airport (47.8 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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