Bay St Louis Weather Forecast

    • 49
    • 67

    Chance Thunderstorms

    • 49
    • 60

    Sunny

    • 58
    • 66

    Partly Sunny

    • 56
    • 68

    Slight Chance Rain Showers

    • 56
    • 64

    Partly Sunny

    • 57
    • 67

    Partly Sunny

Today 18 Dec Southern Hancock

Mostly cloudy this Morning, then becoming partly sunny. A chance of Thunderstorms. Showers Likely, mainly this morning. Areas of fog this morning. Patchy fog this afternoon. Highs in the lower 70s. South Winds 5 to 10 Mph. Chance of rain 70 percent.

Tonight 18 Dec Southern Hancock

Partly cloudy in the Evening, then clearing. Patchy fog in the evening. Cooler with Lows in the mid 40s. West Winds 5 to 10 Mph, becoming northwest with Gusts up to 20 Mph after midnight.

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Bay St Louis Temperature Statistics

December Temperature

Bay St. Louis, Stennis International Airport (8.7 miles)

  • Lowest 15 December, 2025

    26.6 °F

  • Average December

    52.4 °F

  • Highest 13 December, 2025

    77 °F

Climate (2020–Present)

Bay St. Louis, Stennis International Airport (8.7 miles)

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  • Average Low 2020–2025

    59.9 °F

  • Average 2020–2025

    71.2 °F

  • Average High 2020–2025

    78 °F
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