Grantsburg Weather Forecast

    • 75
    • 97

    Hot

    • 75
    • 98

    Hot

    • 74
    • 99

    Slight Chance Thunderstorms

    • 68
    • 92

    Chance Thunderstorms

    • 69
    • 90

    Mostly Sunny

    • 73
    • 95

    Partly Sunny

Today 14 Aug Johnson

Sunny, hot with Highs in the mid 90s. Southwest Winds 5 to 10 Mph. Highest heat index Readings heat index Readings up to 106 in the afternoon.

Tonight 14 Aug Johnson

Mostly clear. Near steady temperature in the upper 70s. South Winds around 5 Mph.

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Grantsburg Temperature Statistics

August Temperature

Metropolis Municipal Airport (14.3 miles)

  • Lowest 5 August, 2026

    61.7 °F

  • Average August

    77.1 °F

  • Highest 11 August, 2026

    94.6 °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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