De Soto Weather Forecast

    • 75
    • 99

    Hot

    • 75
    • 99

    Hot

    • 72
    • 99

    Hot

    • 67
    • 95

    Mostly Sunny

    • 68
    • 93

    Mostly Sunny

    • 74
    • 96

    Mostly Sunny

    • 75
    • 97

    Hot

Today 3 Sep Jackson

Mostly sunny. Hot. Near steady temperature in the upper 90s. South Winds around 5 Mph. Highest heat index Readings heat index Readings up to 107.

Tonight 3 Sep Jackson

Clear. Lows in the mid 70s. South Winds around 5 Mph.

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De Soto Temperature Statistics

September Temperature

Southern Illinois Airport (2.5 miles)

  • Lowest 1 September, 2026

    69.8 °F

  • Average September

    89.6 °F

  • Highest 1 September, 2026

    98.6 °F

Climate (2021–2026)

Southern Illinois Airport (2.5 miles)

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  • Average Low 2021–2026

    48.2 °F

  • Average 2021–2026

    58.8 °F

  • Average High 2021–2026

    69.4 °F
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