St. Simons, GA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Simons, a community in Glynn County, Georgia.
This Afternoon
89°F
Mostly Sunny
Mostly sunny. High near 89, with temperatures falling to around 85 in the afternoon. East wind around 12 mph.
7-day forecast for St. Simons
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 89°F | Mostly Sunny | 12 mph E | 2% |
| Tonight | 73°F | Partly Cloudy | 1 to 9 mph S | 3% |
| Saturday | 90°F | Mostly Sunny | 2 to 7 mph NE | 10% |
| Saturday Night | 74°F | Partly Cloudy | 0 to 6 mph E | 14% |
| Sunday | 89°F | Chance Rain Showers then Chance Showers And Thunderstorms | 0 to 9 mph NE | 26% |
| Sunday Night | 73°F | Chance Showers And Thunderstorms | 0 to 6 mph NE | 25% |
| Monday | 88°F | Slight Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 0 to 9 mph NE | 56% |
| Monday Night | 73°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 0 to 7 mph E | 56% |
| Tuesday | 88°F | Showers And Thunderstorms Likely | 3 to 10 mph NE | 65% |
| Tuesday Night | 73°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 1 to 8 mph NE | 65% |
| Wednesday | 87°F | Showers And Thunderstorms Likely | 6 to 15 mph NE | 59% |
| Wednesday Night | 72°F | Showers And Thunderstorms Likely | 9 to 14 mph NE | 59% |
| Thursday | 86°F | Chance Rain Showers then Chance Showers And Thunderstorms | 14 to 20 mph NE | 35% |
| Thursday Night | 71°F | Chance Showers And Thunderstorms | 9 to 17 mph NE | 35% |
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 Sep 18, 2026.