NWS Forecast for Bay St. Louis MS

National Weather Service Forecast for: Bay St. Louis MS
Issued by: National Weather Service New Orleans/Baton Rouge, LA

Updated: 9:51 pm CST Feb 1, 2026

Tonight Clear then Frost	Monday Frost then Sunny	Monday Night Increasing Clouds	Tuesday Mostly Sunny	Tuesday Night Chance Showers then Showers Likely	Wednesday Chance Showers then Mostly Sunny	Wednesday Night Partly Cloudy	Thursday Sunny	Thursday Night Mostly Clear
Lo 33 °F	Hi 56 °F	Lo 47 °F	Hi 63 °F	Lo 52 °F	Hi 59 °F	Lo 36 °F	Hi 52 °F	Lo 38 °F

Cold Weather Advisory

Tonight	Widespread frost before 2am, then widespread frost after 3am. Otherwise, clear, with a low around 33. West wind around 5 mph.
Monday	Widespread frost, mainly before 7am. Otherwise, sunny, with a high near 56. Light and variable wind becoming south 5 to 10 mph in the afternoon.
Monday Night	Increasing clouds, with a low around 47. Southwest wind 5 to 10 mph.
Tuesday	Mostly sunny, with a high near 63. South wind 5 to 15 mph.
Tuesday Night	Showers likely, mainly after midnight. Mostly cloudy, with a low around 52. South wind around 10 mph becoming northwest after midnight. Chance of precipitation is 70%.
Wednesday	A 50 percent chance of showers before noon. Partly sunny, with a high near 59. North wind 10 to 15 mph.
Wednesday Night	Partly cloudy, with a low around 36. North wind around 15 mph.
Thursday	Sunny, with a high near 52. North wind 10 to 15 mph.
Thursday Night	Mostly clear, with a low around 38. Northwest wind 5 to 10 mph.
Friday	Sunny, with a high near 62. West wind 5 to 10 mph.
Friday Night	Mostly clear, with a low around 44. West wind around 10 mph becoming north after midnight.
Saturday	Sunny, with a high near 61. North wind 5 to 10 mph becoming south in the afternoon.
Saturday Night	Mostly clear, with a low around 44. South wind around 5 mph becoming northeast in the evening.
Sunday	Sunny, with a high near 63. Northeast wind 5 to 10 mph becoming south in the afternoon.

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