Grantsburg Weather Forecast

    • 69
    • 98

    Hot

    • 63
    • 91

    Chance Thunderstorms

    • 58
    • 81

    Slight Chance Rain Showers

    • 56
    • 79

    Partly Sunny

    • 57
    • 79

    Partly Sunny

    • 58
    • 81

    Partly Sunny

Today 20 Sep Johnson

Mostly sunny. Hot with Highs in the upper 90s. Southwest Winds around 5 Mph.

Tonight 20 Sep Johnson

Partly cloudy in the Evening, then becoming mostly cloudy. Lows around 70. West Winds around 5 Mph, becoming northeast after midnight.

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Grantsburg Temperature Statistics

September Temperature

Metropolis Municipal Airport (14.3 miles)

  • Lowest 8 September, 2026

    60.8 °F

  • Average September

    80.6 °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

    59.8 °F

  • Average High 2021–2026

    70.3 °F
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