Arnold Weather Forecast

    • 52
    • 59

    Chance Rain Showers

    • 52
    • 57

    Rain Showers Likely

    • 55
    • 64

    Rain Showers Likely

    • 54
    • 69

    Chance Thunderstorms

    • 54
    • 70

    Slight Chance Thunderstorms

    • 52
    • 66

    Slight Chance Rain Showers

Today 18 Sep Carlton/South St. Louis

Cloudy with a slight chance of Showers. A slight chance of Thunderstorms this afternoon. Much cooler. Near steady temperature in the lower 60s. East Winds 10 to 15 Mph with Gusts up to 30 Mph. Chance of rain 20 percent.

Tonight 18 Sep Carlton/South St. Louis

Cloudy with a chance of Showers with a slight chance of Thunderstorms. Lows in the lower 50s. East Winds 10 to 15 Mph with Gusts up to 30 Mph. Chance of rain 40 percent.

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Arnold Temperature Statistics

September Temperature

Duluth International Airport (5 miles)

  • Lowest 6 September, 2025

    36 °F

  • Average September

    56.7 °F

  • Highest 16 September, 2025

    84 °F

Climate (2020–Present)

Duluth International Airport (5 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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