Upper Waterton Lake Weather Forecast

    • 41
    • 53

    Rain

    • 42
    • 62

    Partly Sunny

    • 45
    • 73

    Mostly Sunny

    • 46
    • 70

    Partly Sunny

    • 46
    • 70

    Mostly Sunny

    • 47
    • 71

    Mostly Sunny

Today 15 Sep East Glacier Park Region

Cloudy. Patchy fog in the morning. Slight chance of rain early in the afternoon. Chance of rain late in the afternoon. Highs 43 to 51. Southeast Winds up to 10 Mph. Chance of rain 50 percent.

Tonight 15 Sep East Glacier Park Region

Cloudy. Rain likely in the Evening, then chance of rain after midnight. Lows 35 to 41. Northeast Winds up to 10 Mph. Chance of rain 70 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Upper Waterton Lake Temperature Statistics

September Temperature

Kalispell, Glacier Park International Airport (49.1 miles)

  • Lowest 1 September, 2026

    41.6 °F

  • Average September

    57.9 °F

  • Highest 1 September, 2026

    84.7 °F

Climate (2021–2026)

Kalispell, Glacier Park International Airport (49.1 miles)

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  • Average Low 2021–2026

    33.4 °F

  • Average 2021–2026

    45.4 °F

  • Average High 2021–2026

    57 °F
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