National Weather Service Forecast for: Bay St. Louis MS
Issued by: National Weather Service New Orleans/Baton Rouge, LA
Updated: 11:30 pm CST Dec 4, 2025
 
Overnight

Overnight: A 40 percent chance of showers and thunderstorms. Cloudy, with a low around 49. North wind around 15 mph.
Chance
T-storms
 Friday

Friday: A chance of showers and thunderstorms, then showers likely after 4pm. Cloudy, with a high near 55. North wind around 10 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Showers
Likely
 Friday
Night
Friday Night: Showers likely, mainly after 3am. Cloudy, with a low around 50. North wind around 5 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Showers
Likely
 Saturday

Saturday: Showers. High near 58. North wind 5 to 10 mph. Chance of precipitation is 80%.
Showers

 Saturday
Night
Saturday Night: A 30 percent chance of showers, mainly after midnight. Mostly cloudy, with a low around 53. East wind 5 to 10 mph.
Chance
Showers
 Sunday

Sunday: A 30 percent chance of showers. Mostly cloudy, with a high near 66. Northeast wind around 5 mph.
Chance
Showers
 Sunday
Night
Sunday Night: A 30 percent chance of showers before midnight. Mostly cloudy, with a low around 48. North wind 5 to 15 mph.
Chance
Showers then
Mostly Cloudy
 Monday

Monday: Mostly sunny, with a high near 57. North wind around 15 mph.
Mostly Sunny

 Monday
Night
Monday Night: Mostly clear, with a low around 40. Northeast wind around 10 mph.
Mostly Clear
Lo 49 °F Hi 55 °F Lo 50 °F Hi 58 °F Lo 53 °F Hi 66 °F Lo 48 °F Hi 57 °F Lo 40 °F

Coastal Flood Advisory
 

Overnight
 
 A 40 percent chance of showers and thunderstorms. Cloudy, with a low around 49. North wind around 15 mph.
Friday
 
 A chance of showers and thunderstorms, then showers likely after 4pm. Cloudy, with a high near 55. North wind around 10 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday Night
 
 Showers likely, mainly after 3am. Cloudy, with a low around 50. North wind around 5 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
 
 Showers. High near 58. North wind 5 to 10 mph. Chance of precipitation is 80%.
Saturday Night
 
 A 30 percent chance of showers, mainly after midnight. Mostly cloudy, with a low around 53. East wind 5 to 10 mph.
Sunday
 
 A 30 percent chance of showers. Mostly cloudy, with a high near 66. Northeast wind around 5 mph.
Sunday Night
 
 A 30 percent chance of showers before midnight. Mostly cloudy, with a low around 48. North wind 5 to 15 mph.
Monday
 
 Mostly sunny, with a high near 57. North wind around 15 mph.
Monday Night
 
 Mostly clear, with a low around 40. Northeast wind around 10 mph.
Tuesday
 
 Sunny, with a high near 57. Northeast wind around 5 mph becoming south in the afternoon.
Tuesday Night
 
 Mostly clear, with a low around 45. South wind around 5 mph.
Wednesday
 
 Sunny, with a high near 66. South wind 5 to 10 mph.
Wednesday Night
 
 A slight chance of showers. Partly cloudy, with a low around 51. Southwest wind around 10 mph becoming north after midnight.
Thursday
 
 Sunny, with a high near 63. North wind around 10 mph becoming east in the afternoon.

 

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