Heart Lake Weather Forecast

    • 43
    • 61

    Rain Showers

    • 44
    • 63

    Rain Showers Likely

    • 45
    • 63

    Rain Showers

    • 38
    • 52

    Rain Showers

    • 38
    • 57

    Partly Sunny

    • 44
    • 63

    Partly Sunny

    • 46
    • 65

    Partly Sunny

Today 4 Sep Southern Rocky Mountain Front

Sunny. A 20 percent chance of rain Showers late in the afternoon. Near steady temperature in the upper 50s. Southwest Winds 5 to 15 Mph.

Tonight 4 Sep Southern Rocky Mountain Front

Slight chance of Thunderstorms in the evening. Chance of rain Showers until early Morning, then rain Showers late in the night. Lows in the lower 40s. West Winds up to 10 Mph shifting to the south after midnight. Chance of precipitation 90 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Heart Lake Temperature Statistics

September Temperature

Helena Regional Airport (47.8 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 (47.8 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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