Heart Lake Weather Forecast

    • 45
    • 65

    Partly Sunny

    • 34
    • 56

    Rain/Snow

    • 31
    • 41

    Snow Likely

    • 30
    • 45

    Chance Rain/Snow

    • 27
    • 38

    Chance Snow

    • 28
    • 41

    Partly Sunny

Today 12 May Lower Clark Fork Region

Mostly sunny. Highs in the 80s.

Tonight 12 May Lower Clark Fork Region

Partly cloudy. Lows in the mid 40s to lower 50s. East Winds to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Heart Lake Temperature Statistics

May Temperature

Missoula, Missoula International Airport (41 miles)

  • Lowest 1 May, 2026

    31.6 °F

  • Average May

    55 °F

  • Highest 3 May, 2026

    77.6 °F

Climate (2021–Present)

Missoula, Missoula International Airport (41 miles)

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  • Average Low 2021–2026

    36.1 °F

  • Average 2021–2026

    47.7 °F

  • Average High 2021–2026

    59.8 °F
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