Bay St. Louis, MS Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Bay St. Louis, a city in Hancock County, Mississippi.
Today
93°F
Sunny then Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms between 2pm and 4pm. Sunny. High near 93, with temperatures falling to around 91 in the afternoon. East wind around 5 mph. Chance of precipitation is 20%.
7-day forecast for Bay St. Louis
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 93°F | Sunny then Slight Chance Showers And Thunderstorms | 5 mph E | 17% |
| Tonight | 76°F | Mostly Clear | 5 mph SW | 8% |
| Wednesday | 93°F | Sunny then Slight Chance Showers And Thunderstorms | 0 to 10 mph SW | 21% |
| Wednesday Night | 76°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 0 to 10 mph SW | 17% |
| Thursday | 91°F | Sunny then Slight Chance Showers And Thunderstorms | 0 to 10 mph S | 17% |
| Thursday Night | 76°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 0 to 5 mph E | 17% |
| Friday | 90°F | Slight Chance Showers And Thunderstorms | 0 to 10 mph E | 22% |
| Friday Night | 75°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 0 to 5 mph E | 22% |
| Saturday | 91°F | Slight Chance Showers And Thunderstorms | 0 to 10 mph E | 19% |
| Saturday Night | 76°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SE | 19% |
| Sunday | 90°F | Chance Showers And Thunderstorms | 0 to 10 mph E | 38% |
| Sunday Night | 76°F | Chance Showers And Thunderstorms | 0 to 5 mph S | 37% |
| Monday | 90°F | Chance Showers And Thunderstorms | 0 to 10 mph S | 43% |
| Monday Night | 77°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph S | 39% |
Forecast source: National Weather Service (api.weather.gov) for Bay St. Louis (30.323, -89.359). Updated through the day.
Growing snapshot for Bay St. Louis
Last spring frost
Feb 21
First fall frost
Dec 3
Growing season
287 days
Hardiness zone
9a
More local growing data for Bay St. Louis: nearby ZIP 39576 weather · frost dates · planting calendar · Mississippi frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Waveland, Ms (0.3 mi from Bay St. Louis). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.