Grantsburg Weather Forecast

    • 68
    • 88

    Rain Showers Likely

    • 68
    • 86

    Chance Rain Showers

    • 68
    • 90

    Slight Chance Thunderstorms

    • 67
    • 91

    Mostly Sunny

    • 68
    • 93

    Sunny

    • 65
    • 93

    Chance Rain Showers

Today 10 Sep Johnson

Showers likely with a chance of Thunderstorms. Near steady temperature in the mid 80s. North Winds around 5 Mph. Chance of rain 70 percent.

Tonight 10 Sep Johnson

Mostly cloudy. Showers likely with a chance of Thunderstorms in the Evening, then a chance of Showers with a slight chance of Thunderstorms after midnight. Patchy fog after midnight. Lows in the upper 60s. North Winds around 5 Mph in the Evening, becoming light and variable. Chance of rain 70 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grantsburg Temperature Statistics

September Temperature

Metropolis Municipal Airport (14.3 miles)

  • Lowest 8 September, 2026

    60.8 °F

  • Average September

    81.7 °F

  • Highest 5 September, 2026

    101.3 °F

Climate (2021–2026)

Metropolis Municipal Airport (14.3 miles)

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  • Average Low 2021–2026

    49.5 °F

  • Average 2021–2026

    59.8 °F

  • Average High 2021–2026

    70.2 °F
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