Slidell Weather Forecast

    • 70
    • 93

    Chance Thunderstorms

    • 69
    • 92

    Increasing Clouds

    • 69
    • 92

    Partly Sunny

    • 68
    • 91

    Partly Sunny

    • 70
    • 91

    Partly Sunny

    • 72
    • 94

    Partly Sunny

    • 72
    • 95

    Partly Sunny

Today 21 Sep Wise

Mostly sunny with a chance of Showers. A slight chance of Thunderstorms in the afternoon. Highs in the lower 90s. Chance of rain 30 percent.

Tonight 21 Sep Wise

Mostly clear with a 30 percent chance of Showers and Thunderstorms this Evening, then partly cloudy after midnight. Lows around 70. Northeast Winds 15 to 20 Mph with Gusts up to 30 Mph, Diminishing to around 5 Mph after midnight.

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Slidell Temperature Statistics

September Temperature

Decatur, Decatur Municipal Airport (13 miles)

  • Lowest 3 September, 2026

    73.4 °F

  • Average September

    87.4 °F

  • Highest 8 September, 2026

    102.2 °F

Climate (2021–2026)

Decatur, Decatur Municipal Airport (13 miles)

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  • Average Low 2021–2026

    57.4 °F

  • Average 2021–2026

    67.4 °F

  • Average High 2021–2026

    78 °F
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