Boulder Lake Reservoir Weather Forecast

    • 57
    • 83

    Slight Chance Thunderstorms

    • 55
    • 79

    Chance Rain Showers

    • 52
    • 65

    Chance Rain Showers

    • 51
    • 64

    Chance Rain Showers

    • 53
    • 65

    Chance Rain Showers

    • 55
    • 68

    Chance Rain Showers

Today 16 Sep Central St. Louis

Sunny, hot with Highs in the lower 80s. South Winds 5 to 10 Mph.

Tonight 16 Sep Central St. Louis

Partly cloudy with a slight chance of Showers and Thunderstorms. Patchy fog after midnight. Humid with Lows in the upper 50s. West Winds around 5 Mph, becoming northwest after midnight. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Boulder Lake Reservoir Temperature Statistics

September Temperature

Duluth International Airport (14.9 miles)

  • Lowest 6 September, 2025

    36 °F

  • Average September

    55.2 °F

  • Highest 1 September, 2025

    75 °F

Climate (2020–Present)

Duluth International Airport (14.9 miles)

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  • Average Low 2020–2025

    33.6 °F

  • Average 2020–2025

    42.3 °F

  • Average High 2020–2025

    51 °F
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