Grantsburg Weather Forecast

    • 66
    • 89

    Mostly Sunny

    • 71
    • 94

    Mostly Sunny

    • 73
    • 96

    Sunny

    • 74
    • 97

    Hot

    • 75
    • 97

    Hot

    • 74
    • 99

    Hot

Today 29 Aug Johnson

Sunny. Highs in the upper 80s. Calm Winds, becoming southeast around 5 Mph this afternoon.

Tonight 29 Aug Johnson

Mostly clear. Lows in the mid 60s. Calm Winds.

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Grantsburg Temperature Statistics

August Temperature

Metropolis Municipal Airport (14.3 miles)

  • Lowest 24 August, 2026

    57.6 °F

  • Average August

    77.7 °F

  • Highest 16 August, 2026

    98.4 °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

    70.1 °F
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