Grantsburg Weather Forecast

    • 75
    • 95

    Mostly Sunny

    • 74
    • 95

    Sunny

    • 76
    • 96

    Hot

    • 77
    • 97

    Hot

    • 77
    • 95

    Slight Chance Thunderstorms

    • 76
    • 94

    Chance Thunderstorms

Today 29 Jun Johnson

Sunny. Near steady temperature in the lower 90s. South Winds 5 to 10 Mph. Highest heat index Readings heat index Readings up to 107.

Tonight 29 Jun Johnson

Mostly clear. Humid with Lows in the mid 70s. South Winds 5 to 10 Mph.

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Grantsburg Temperature Statistics

June Temperature

Metropolis Municipal Airport (14.3 miles)

  • Lowest 3 June, 2026

    52.5 °F

  • Average June

    74.2 °F

  • Highest 11 June, 2026

    90.3 °F

Climate (2021–2026)

Metropolis Municipal Airport (14.3 miles)

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  • Average Low 2021–2026

    49.2 °F

  • Average 2021–2026

    59.5 °F

  • Average High 2021–2026

    69.9 °F
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