National Weather Service Forecast for: Bay St. Louis MS
Issued by: National Weather Service New Orleans/Baton Rouge, LA
Updated: 6:45 pm CDT Aug 25, 2026
 
Tonight

Tonight: Clear, with a low around 78. West wind around 5 mph.
Clear

 Wednesday

Wednesday: A 50 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 91. Heat index values as high as 108. Northwest wind around 5 mph becoming south in the morning. New rainfall amounts between a quarter and half of an inch possible.
Sunny then
Chance
T-storms
 Wednesday
Night
Wednesday Night: A 30 percent chance of showers and thunderstorms, mainly between 4am and 5am. Partly cloudy, with a low around 79. South wind around 5 mph.
Partly Cloudy
then Chance
Showers
 Thursday

Thursday: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 7am. High near 88. West wind around 5 mph becoming north in the afternoon. Chance of precipitation is 80%.
Showers
Likely then
T-storms
 Thursday
Night
Thursday Night: Showers and possibly a thunderstorm. Low around 77. South wind around 5 mph becoming calm. Chance of precipitation is 80%.
Showers

 Friday

Friday: Showers and possibly a thunderstorm. High near 88. Northwest wind around 5 mph becoming southwest in the afternoon. Chance of precipitation is 80%.
Showers
Likely then
T-storms
 Friday
Night
Friday Night: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 76. Calm wind becoming northeast around 5 mph.
Chance
T-storms

 Saturday

Saturday: A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88. North wind around 5 mph becoming southeast in the afternoon.
Chance
T-storms

 Saturday
Night
Saturday Night: A chance of showers and thunderstorms, mainly after 1am. Mostly clear, with a low around 78. Southeast wind around 5 mph becoming calm in the evening.
Slight Chance
T-storms then
Chance
Showers
Lo 78 °F Hi 91 °F Lo 79 °F Hi 88 °F Lo 77 °F Hi 88 °F Lo 76 °F Hi 88 °F Lo 78 °F

 

Tonight
 
 Clear, with a low around 78. West wind around 5 mph.
Wednesday
 
 A 50 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 91. Heat index values as high as 108. Northwest wind around 5 mph becoming south in the morning. New rainfall amounts between a quarter and half of an inch possible.
Wednesday Night
 
 A 30 percent chance of showers and thunderstorms, mainly between 4am and 5am. Partly cloudy, with a low around 79. South wind around 5 mph.
Thursday
 
 A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 7am. High near 88. West wind around 5 mph becoming north in the afternoon. Chance of precipitation is 80%.
Thursday Night
 
 Showers and possibly a thunderstorm. Low around 77. South wind around 5 mph becoming calm. Chance of precipitation is 80%.
Friday
 
 Showers and possibly a thunderstorm. High near 88. Northwest wind around 5 mph becoming southwest in the afternoon. Chance of precipitation is 80%.
Friday Night
 
 A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 76. Calm wind becoming northeast around 5 mph.
Saturday
 
 A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88. North wind around 5 mph becoming southeast in the afternoon.
Saturday Night
 
 A chance of showers and thunderstorms, mainly after 1am. Mostly clear, with a low around 78. Southeast wind around 5 mph becoming calm in the evening.
Sunday
 
 A chance of showers and thunderstorms. Mostly sunny, with a high near 88. East wind 5 to 10 mph becoming southeast in the afternoon.
Sunday Night
 
 A slight chance of showers and thunderstorms. Mostly clear, with a low around 78. Southeast wind around 5 mph.
Monday
 
 A chance of showers and thunderstorms. Mostly sunny, with a high near 88. East wind 5 to 10 mph.
Monday Night
 
 A slight chance of showers. Mostly clear, with a low around 78. Southeast wind around 5 mph becoming calm after midnight.
Tuesday
 
 A chance of showers and thunderstorms. Mostly sunny, with a high near 89. North wind 5 to 10 mph becoming southeast in the afternoon.

 

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