National Weather Service Forecast for: Bay St. Louis MS
Issued by: National Weather Service New Orleans/Baton Rouge, LA
Updated: 3:51 pm CDT Jun 18, 2025
 
This
Afternoon
This Afternoon: A 20 percent chance of showers and thunderstorms. Sunny, with a high near 87. South wind around 10 mph.
Slight Chance
T-storms
 Tonight

Tonight: A 20 percent chance of showers and thunderstorms before 10pm. Partly cloudy, with a low around 79. Southwest wind 5 to 10 mph.
Slight Chance
T-storms then
Mostly Clear
 Juneteenth

Juneteenth: A 50 percent chance of showers and thunderstorms, mainly after 10am. Mostly sunny, with a high near 90. Southwest wind 5 to 10 mph. New rainfall amounts between a quarter and half of an inch possible.
Chance
T-storms
 Thursday
Night
Thursday Night: A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 78. Southwest wind 5 to 10 mph.
Chance
T-storms
 Friday

Friday: A 50 percent chance of showers and thunderstorms. Sunny, with a high near 91. Northwest wind around 5 mph becoming southwest in the afternoon.
Chance
T-storms
 Friday
Night
Friday Night: A 20 percent chance of showers and thunderstorms. Mostly clear, with a low around 79. Southwest wind around 5 mph.
Slight Chance
T-storms
 Saturday

Saturday: A 40 percent chance of showers and thunderstorms, mainly after 1pm. Sunny, with a high near 89. Northwest wind 5 to 10 mph becoming east in the morning.
Chance
T-storms
 Saturday
Night
Saturday Night: Mostly clear, with a low around 79. South wind around 5 mph becoming calm after midnight.
Mostly Clear

 Sunday

Sunday: A chance of showers and thunderstorms, mainly after 1pm. Sunny, with a high near 88. Northeast wind 5 to 10 mph becoming southeast in the afternoon.
Chance
T-storms
Hi 87 °F Lo 79 °F Hi 90 °F Lo 78 °F Hi 91 °F Lo 79 °F Hi 89 °F Lo 79 °F Hi 88 °F

 

This Afternoon
 
 A 20 percent chance of showers and thunderstorms. Sunny, with a high near 87. South wind around 10 mph.
Tonight
 
 A 20 percent chance of showers and thunderstorms before 10pm. Partly cloudy, with a low around 79. Southwest wind 5 to 10 mph.
Juneteenth
 
 A 50 percent chance of showers and thunderstorms, mainly after 10am. Mostly sunny, with a high near 90. Southwest wind 5 to 10 mph. New rainfall amounts between a quarter and half of an inch possible.
Thursday Night
 
 A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 78. Southwest wind 5 to 10 mph.
Friday
 
 A 50 percent chance of showers and thunderstorms. Sunny, with a high near 91. Northwest wind around 5 mph becoming southwest in the afternoon.
Friday Night
 
 A 20 percent chance of showers and thunderstorms. Mostly clear, with a low around 79. Southwest wind around 5 mph.
Saturday
 
 A 40 percent chance of showers and thunderstorms, mainly after 1pm. Sunny, with a high near 89. Northwest wind 5 to 10 mph becoming east in the morning.
Saturday Night
 
 Mostly clear, with a low around 79. South wind around 5 mph becoming calm after midnight.
Sunday
 
 A chance of showers and thunderstorms, mainly after 1pm. Sunny, with a high near 88. Northeast wind 5 to 10 mph becoming southeast in the afternoon.
Sunday Night
 
 A slight chance of showers and thunderstorms after 1am. Mostly clear, with a low around 79. Southeast wind 5 to 10 mph.
Monday
 
 A chance of showers and thunderstorms. Sunny, with a high near 89. Northeast wind 5 to 10 mph becoming southeast in the afternoon.
Monday Night
 
 A slight chance of showers and thunderstorms. Mostly clear, with a low around 78. Southeast wind 5 to 10 mph becoming northeast after midnight.
Tuesday
 
 A chance of showers and thunderstorms. Sunny, with a high near 89. Northeast wind 5 to 10 mph becoming southeast in the afternoon.
Tuesday Night
 
 A chance of showers and thunderstorms. Partly cloudy, with a low around 78. South wind 5 to 10 mph becoming northeast after midnight.
Wednesday
 
 A chance of showers and thunderstorms. Mostly sunny, with a high near 89. Northeast wind 5 to 10 mph becoming southeast in the afternoon.

 

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