St. Simons, GA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Simons, a community in Glynn County, Georgia.
Overnight
67°F
Partly Cloudy
Partly cloudy. Low around 67, with temperatures rising to around 69 overnight. East wind around 5 mph.
7-day forecast for St. Simons
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 67°F | Partly Cloudy | 5 mph E | 0% |
| Wednesday | 79°F | Partly Sunny | 6 to 10 mph SE | 2% |
| Wednesday Night | 65°F | Mostly Cloudy | 0 to 6 mph SE | 4% |
| Thursday | 80°F | Patchy Fog then Mostly Sunny | 0 to 6 mph SE | 9% |
| Thursday Night | 65°F | Partly Cloudy then Patchy Fog | 2 mph S | 6% |
| Friday | 81°F | Partly Sunny then Slight Chance Rain Showers | 2 to 6 mph SW | 24% |
| Friday Night | 58°F | Slight Chance Rain Showers then Mostly Cloudy | 0 to 3 mph W | 24% |
| Saturday | 76°F | Sunny | 6 mph NW | 1% |
| Saturday Night | 53°F | Partly Cloudy | 2 to 6 mph N | 1% |
| Sunday | 71°F | Mostly Sunny | 8 mph NE | 1% |
| Sunday Night | 52°F | Partly Cloudy | 2 to 6 mph N | 11% |
| Monday | 69°F | Slight Chance Rain Showers | 9 mph N | 15% |
| Monday Night | 50°F | Slight Chance Rain Showers | 2 to 6 mph N | 15% |
| Tuesday | 70°F | Mostly Sunny then Slight Chance Rain Showers | 7 mph NE | 15% |
Forecast source: National Weather Service (api.weather.gov) for St. Simons (31.180, -81.385). Updated through the day.
Growing snapshot for St. Simons
Last spring frost
Feb 9
First fall frost
Dec 26
Growing season
312 days
Hardiness zone
9a
More local growing data for St. Simons: nearby ZIP 31561 weather · frost dates · planting calendar · Georgia frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Brunswick Malcolm Mckinnon Ap, Ga (6.2 mi from St. Simons). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.