Grand Tower Weather Forecast

    • 56
    • 71

    Mostly Cloudy

    • 58
    • 73

    Mostly Cloudy

    • 55
    • 80

    Partly Sunny

    • 56
    • 77

    Mostly Cloudy

    • 57
    • 80

    Partly Sunny

    • 61
    • 83

    Mostly Sunny

Today 23 Sep Jackson

Partly sunny this Morning, then becoming mostly cloudy. Highs in the lower 70s. North Winds 5 to 10 Mph.

Tonight 23 Sep Jackson

Mostly cloudy in the Evening, then becoming partly cloudy. Lows in the mid 50s. North Winds 5 to 10 Mph.

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Grand Tower Temperature Statistics

September Temperature

Southern Illinois Airport (17.4 miles)

  • Lowest 8 September, 2026

    58.6 °F

  • Average September

    82.9 °F

  • Highest 5 September, 2026

    103.6 °F

Climate (2021–2026)

Southern Illinois Airport (17.4 miles)

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  • Average Low 2021–2026

    48.3 °F

  • Average 2021–2026

    58.9 °F

  • Average High 2021–2026

    69.5 °F
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