Grantsburg Weather Forecast

    • 64
    • 94

    Mostly Sunny

    • 64
    • 92

    Mostly Cloudy

    • 65
    • 92

    Partly Sunny

    • 66
    • 90

    Chance Thunderstorms

    • 65
    • 84

    Chance Thunderstorms

    • 62
    • 84

    Chance Rain Showers

Today 18 Sep Johnson

Sunny. Highs in the mid 90s. South Winds around 5 Mph.

Tonight 18 Sep Johnson

Mostly clear in the Evening, then becoming partly cloudy. Lows in the mid 60s. Southeast Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grantsburg Temperature Statistics

September Temperature

Metropolis Municipal Airport (14.3 miles)

  • Lowest 8 September, 2025

    45.1 °F

  • Average September

    71.5 °F

  • Highest 14 September, 2025

    95.7 °F

Climate (2020–Present)

Metropolis Municipal Airport (14.3 miles)

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  • Average Low 2020–2025

    49.3 °F

  • Average 2020–2025

    59.6 °F

  • Average High 2020–2025

    70 °F
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