Heart Lake Weather Forecast

    • 52
    • 75

    Patchy Smoke

    • 54
    • 74

    Decreasing Clouds

    • 55
    • 77

    Chance Thunderstorms

    • 56
    • 79

    Slight Chance Thunderstorms

    • 56
    • 80

    Mostly Sunny

    • 53
    • 78

    Sunny

    • 53
    • 78

    Mostly Sunny

Today 20 Jul Southern Rocky Mountain Front

Partly sunny. Patchy smoke. Highs 68 to 78. Northeast Winds 5 to 10 Mph.

Tonight 20 Jul Southern Rocky Mountain Front

Mostly cloudy. Patchy smoke through the night. A 20 percent chance of rain Showers after midnight. Lows 50 to 56. East Winds up to 10 Mph with Gusts to around 25 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Heart Lake Temperature Statistics

July Temperature

Helena Regional Airport (47.8 miles)

  • Lowest 2 July, 2026

    47.6 °F

  • Average July

    72 °F

  • Highest 11 July, 2026

    101.6 °F

Climate (2021–2026)

Helena Regional Airport (47.8 miles)

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  • Average Low 2021–2026

    36.4 °F

  • Average 2021–2026

    47.9 °F

  • Average High 2021–2026

    59.9 °F
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