Diversion Lake Weather Forecast

    • 44
    • 62

    Decreasing Clouds

    • 45
    • 71

    Mostly Sunny

    • 46
    • 75

    Mostly Sunny

    • 48
    • 74

    Partly Sunny

    • 47
    • 72

    Partly Sunny

    • 48
    • 72

    Partly Sunny

    • 45
    • 69

    Slight Chance Rain

Today 19 Sep Southern Rocky Mountain Front

Partly sunny with a 20 percent chance of rain. Highs 49 to 57.

Tonight 19 Sep Southern Rocky Mountain Front

Mostly cloudy early in the evening then becoming partly cloudy. Lows in the lower 40s. Southeast Winds up to 5 Mph shifting to the southwest after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Diversion Lake Temperature Statistics

September Temperature

Great Falls, Great Falls International Airport (62.8 miles)

  • Lowest 16 September, 2026

    40.6 °F

  • Average September

    59.2 °F

  • Highest 1 September, 2026

    86.6 °F

Climate (2021–2026)

Great Falls, Great Falls International Airport (62.8 miles)

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  • Average Low 2021–2026

    34.3 °F

  • Average 2021–2026

    46.9 °F

  • Average High 2021–2026

    59.1 °F
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