Grantsburg Weather Forecast

    • 60
    • 84

    Mostly Sunny

    • 65
    • 89

    Partly Sunny

    • 68
    • 91

    Mostly Cloudy

    • 61
    • 82

    Rain Showers Likely

    • 61
    • 73

    Chance Rain Showers

    • 53
    • 73

    Slight Chance Thunderstorms

Today 29 Sep Johnson

Sunny. Highs in the lower 80s. South Winds around 5 Mph.

Tonight 29 Sep Johnson

Mostly clear in the Evening, then becoming partly cloudy. Lows around 60. Calm Winds, becoming southeast around 5 Mph after midnight.

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Grantsburg Temperature Statistics

September Temperature

Metropolis Municipal Airport (14.3 miles)

  • Lowest 26 September, 2026

    54.5 °F

  • Average September

    77.7 °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

    49.6 °F

  • Average 2021–2026

    59.9 °F

  • Average High 2021–2026

    70.3 °F
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