Boulder Lake Reservoir Weather Forecast

    • 56
    • 69

    Rain Showers Likely

    • 49
    • 75

    Partly Sunny

    • 55
    • 78

    Partly Sunny

    • 50
    • 76

    Chance Rain Showers

    • 48
    • 72

    Slight Chance Rain Showers

    • 52
    • 75

    Partly Sunny

Today 15 Aug Central St. Louis

A slight chance of Thunderstorms. Showers likely. Cooler with Highs around 70. Southeast Winds 5 to 10 Mph with Gusts up to 25 Mph. Chance of rain 70 percent.

Tonight 15 Aug Central St. Louis

Mostly cloudy. A chance of Showers with a slight chance of Thunderstorms in the evening. Patchy fog. Humid with Lows in the mid 50s. South Winds around 5 Mph, becoming northwest with Gusts up to 20 Mph after midnight. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

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Boulder Lake Reservoir Temperature Statistics

August Temperature

Duluth International Airport (14.9 miles)

  • Lowest 5 August, 2026

    48.7 °F

  • Average August

    66.5 °F

  • Highest 6 August, 2026

    80.7 °F

Climate (2021–2026)

Duluth International Airport (14.9 miles)

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  • Average Low 2021–2026

    33.3 °F

  • Average 2021–2026

    42.2 °F

  • Average High 2021–2026

    51 °F
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