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
80°F
Patchy Fog then Chance Showers And Thunderstorms
Patchy fog and a slight chance of rain showers before noon, then a chance of showers and thunderstorms between noon and 5pm. Mostly sunny. High near 80, with temperatures falling to around 76 in the afternoon. Southwest wind 0 to 5 mph. Chance of precipitation is 30%.
7-day forecast for Bay St. Louis
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 80°F | Patchy Fog then Chance Showers And Thunderstorms | 0 to 5 mph SW | 34% |
| Tonight | 60°F | Areas Of Fog | 0 to 5 mph N | 3% |
| Thursday | 79°F | Sunny | 0 to 5 mph E | 0% |
| Thursday Night | 63°F | Partly Cloudy | 0 to 5 mph W | 1% |
| Friday | 78°F | Mostly Sunny | 0 to 5 mph N | 5% |
| Friday Night | 55°F | Mostly Clear | 0 to 10 mph N | 1% |
| Saturday | 73°F | Mostly Sunny | 5 to 10 mph N | 0% |
| Saturday Night | 50°F | Partly Cloudy | 5 to 10 mph N | 1% |
| Sunday | 68°F | Slight Chance Rain Showers then Mostly Sunny | 5 to 10 mph N | 15% |
| Sunday Night | 48°F | Partly Cloudy | 5 mph N | 4% |
| Monday | 70°F | Sunny | 5 mph N | 6% |
| Monday Night | 48°F | Mostly Clear | 0 to 5 mph N | 4% |
| Tuesday | 71°F | Sunny | 0 to 5 mph E | 6% |
| Tuesday Night | 50°F | Partly Cloudy | 0 to 5 mph NW | 6% |
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 Nov 4, 2026.