St. Marys, GA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Marys, a city in Camden County, Georgia.
Today
91°F
Mostly Sunny then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 3pm. Mostly sunny. High near 91, with temperatures falling to around 86 in the afternoon. Heat index values as high as 101. Southwest wind 3 to 9 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for St. Marys
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 91°F | Mostly Sunny then Chance Showers And Thunderstorms | 3 to 9 mph SW | 35% |
| Tonight | 74°F | Chance Showers And Thunderstorms | 2 to 9 mph S | 35% |
| Wednesday | 91°F | Mostly Sunny then Chance Showers And Thunderstorms | 2 to 9 mph S | 37% |
| Wednesday Night | 75°F | Chance Showers And Thunderstorms | 1 to 9 mph S | 27% |
| Thursday | 89°F | Chance Showers And Thunderstorms | 0 to 10 mph SE | 30% |
| Thursday Night | 77°F | Chance Showers And Thunderstorms then Partly Cloudy | 2 to 9 mph SE | 30% |
| Friday | 89°F | Chance Showers And Thunderstorms | 2 to 13 mph E | 45% |
| Friday Night | 76°F | Chance Showers And Thunderstorms | 2 to 10 mph E | 29% |
| Saturday | 89°F | Showers And Thunderstorms Likely | 3 to 9 mph E | 59% |
| Saturday Night | 75°F | Chance Showers And Thunderstorms then Mostly Cloudy | 1 to 8 mph SE | 49% |
| Sunday | 92°F | Chance Showers And Thunderstorms | 0 to 7 mph S | 46% |
| Sunday Night | 76°F | Chance Showers And Thunderstorms then Mostly Cloudy | 0 to 7 mph S | 46% |
| Monday | 93°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 to 6 mph S | 33% |
| Monday Night | 76°F | Chance Showers And Thunderstorms then Partly Cloudy | 1 to 6 mph S | 33% |
Forecast source: National Weather Service (api.weather.gov) for St. Marys (30.754, -81.573). Updated through the day.
Growing snapshot for St. Marys
Last spring frost
Feb 19
First fall frost
Dec 14
Growing season
299 days
Hardiness zone
9a
More local growing data for St. Marys: nearby ZIP 31547 weather · frost dates · planting calendar · Georgia frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Brunswick 23 S, Ga (4.6 mi from St. Marys). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.