Grantsburg Weather Forecast

    • 75
    • 99

    Hot

    • 73
    • 101

    Hot

    • 65
    • 94

    Mostly Sunny

    • 66
    • 92

    Mostly Sunny

    • 71
    • 95

    Mostly Sunny

    • 73
    • 97

    Hot

Today 4 Sep Johnson

Sunny with a slight chance of Showers and Thunderstorms. Hot. Near steady temperature in the upper 90s. Southwest Winds around 5 Mph. Chance of rain 20 percent. Highest heat index Readings heat index Readings up to 106.

Tonight 4 Sep Johnson

Mostly clear. Lows in the mid 70s. Calm Winds.

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Grantsburg Temperature Statistics

September Temperature

Metropolis Municipal Airport (14.3 miles)

  • Lowest 1 September, 2026

    69.3 °F

  • Average September

    82.8 °F

  • Highest 2 September, 2026

    97.3 °F

Climate (2021–2026)

Metropolis Municipal Airport (14.3 miles)

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  • Average Low 2021–2026

    49.5 °F

  • Average 2021–2026

    59.7 °F

  • Average High 2021–2026

    70.2 °F
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