St. Simons, GA Weather & Growing Conditions
Today
88°F
Mostly Sunny then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 3pm. Mostly sunny. High near 88, with temperatures falling to around 87 in the afternoon. Heat index values as high as 100. South wind 7 to 14 mph, with gusts as high as 18 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 88°F | Mostly Sunny then Chance Showers And Thunderstorms | 7 to 14 mph S | 30% |
| Tonight | 77°F | Chance Showers And Thunderstorms then Partly Cloudy | 8 to 16 mph S | 43% |
| Wednesday | 88°F | Mostly Sunny | 5 to 14 mph S | 14% |
| Wednesday Night | 78°F | Slight Chance Showers And Thunderstorms | 5 to 14 mph S | 41% |
| Thursday | 88°F | Chance Showers And Thunderstorms | 2 to 10 mph S | 41% |
| Thursday Night | 79°F | Slight Chance Showers And Thunderstorms | 6 to 10 mph SE | 18% |
| Friday | 88°F | Chance Showers And Thunderstorms | 6 to 14 mph E | 44% |
| Friday Night | 78°F | Slight Chance Showers And Thunderstorms | 7 to 13 mph E | 42% |
| Saturday | 87°F | Showers And Thunderstorms Likely | 7 to 10 mph SE | 63% |
| Saturday Night | 78°F | Chance Showers And Thunderstorms | 5 to 9 mph S | 32% |
| Sunday | 89°F | Chance Showers And Thunderstorms | 3 to 9 mph S | 32% |
| Sunday Night | 78°F | Chance Showers And Thunderstorms | 5 to 9 mph S | 32% |
| Monday | 90°F | Mostly Sunny then Chance Showers And Thunderstorms | 5 to 9 mph S | 25% |
| Monday Night | 78°F | Chance Showers And Thunderstorms then Partly Cloudy | 6 to 9 mph S | 25% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for St. Simons, GA
Last spring frost
Feb 9
First fall frost
Dec 26
Growing season
312 days
Hardiness zone
9a
Explore more for St. Simons, GA: full frost dates · planting calendar · Georgia frost dates
Climate data from the nearest NOAA station, Brunswick Malcolm Mckinnon Ap, Ga (6.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.