National Weather Service Forecast for: Bay St. Louis MS
Issued by: National Weather Service New Orleans/Baton Rouge, LA
Updated: 1:11 pm CST Dec 22, 2025
 
Tonight

Tonight: Patchy fog after midnight. Otherwise, mostly clear, with a low around 59. East wind 5 to 10 mph.
Mostly Clear
then Patchy
Fog
 Tuesday

Tuesday: Patchy fog before 9am. Otherwise, sunny, with a high near 69. East wind 5 to 10 mph.
Patchy Fog
then Sunny
 Tuesday
Night
Tuesday Night: Areas of fog after 9pm. Otherwise, mostly cloudy, with a low around 59. East wind around 5 mph becoming calm in the evening.
Areas Fog

 Wednesday

Wednesday: Areas of fog before 8am. Otherwise, partly sunny, with a high near 68. Calm wind becoming southeast around 5 mph in the afternoon.
Areas Fog
then Partly
Sunny
 Wednesday
Night
Wednesday Night: Areas of fog after midnight. Otherwise, mostly cloudy, with a low around 57. Southeast wind around 5 mph becoming calm in the evening.
Mostly Cloudy
then Areas
Fog
 Christmas
Day
Christmas Day: Areas of fog before 10am. Otherwise, partly sunny, with a high near 68. Calm wind becoming south around 5 mph in the afternoon.
Areas Fog
then Partly
Sunny
 Thursday
Night
Thursday Night: Mostly cloudy, with a low around 59. South wind around 5 mph.
Mostly Cloudy

 Friday

Friday: Mostly sunny, with a high near 70. Southwest wind 5 to 10 mph.
Mostly Sunny

 Friday
Night
Friday Night: Mostly clear, with a low around 61. Southwest wind 5 to 10 mph.
Mostly Clear
Lo 59 °F Hi 69 °F Lo 59 °F Hi 68 °F Lo 57 °F Hi 68 °F Lo 59 °F Hi 70 °F Lo 61 °F

 

Tonight
 
 Patchy fog after midnight. Otherwise, mostly clear, with a low around 59. East wind 5 to 10 mph.
Tuesday
 
 Patchy fog before 9am. Otherwise, sunny, with a high near 69. East wind 5 to 10 mph.
Tuesday Night
 
 Areas of fog after 9pm. Otherwise, mostly cloudy, with a low around 59. East wind around 5 mph becoming calm in the evening.
Wednesday
 
 Areas of fog before 8am. Otherwise, partly sunny, with a high near 68. Calm wind becoming southeast around 5 mph in the afternoon.
Wednesday Night
 
 Areas of fog after midnight. Otherwise, mostly cloudy, with a low around 57. Southeast wind around 5 mph becoming calm in the evening.
Christmas Day
 
 Areas of fog before 10am. Otherwise, partly sunny, with a high near 68. Calm wind becoming south around 5 mph in the afternoon.
Thursday Night
 
 Mostly cloudy, with a low around 59. South wind around 5 mph.
Friday
 
 Mostly sunny, with a high near 70. Southwest wind 5 to 10 mph.
Friday Night
 
 Mostly clear, with a low around 61. Southwest wind 5 to 10 mph.
Saturday
 
 Mostly sunny, with a high near 71. Southwest wind 5 to 10 mph.
Saturday Night
 
 Mostly clear, with a low around 60. South wind 5 to 10 mph.
Sunday
 
 A chance of showers. Partly sunny, with a high near 70. Southwest wind 5 to 10 mph becoming northwest in the afternoon.
Sunday Night
 
 A slight chance of showers. Mostly cloudy, with a low around 49. North wind 10 to 15 mph.
Monday
 
 Partly sunny, with a high near 57. North wind 10 to 15 mph.

 

Forecast from NOAA-NWS for Bay St. Louis MS.