nomadseason

Monthly climate in Saint Simons Island, Georgia, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Saint Simons Island features a humid subtropical climate (Cfa).Temperatures typically range between 13 °C (55 °F) and 27 °C (82 °F) through the year, but rarely can drop to 0 °C (33 °F) or can rise to as high as 32 °C (90 °F).The average annual precipitation amounts to about 1199 mm (47.2 inches) and receives 130 rainy days on the 1 mm (0.04 inches) threshold annually.Saint Simons Island enjoys an average of 3428 hours of sunshine throughout the year, and daylight varies from 10 hours 8 minutes to 14 hours 7 minutes per day.

Monthly average temperatures in Saint Simons Island, Georgia, United States §

The warmest months in Saint Simons Island are July, August and September, with daily mean temperatures ranging from 27 to 27 °C (80 - 82 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 13 to 15 °C (55 - 59 °F) throughout the day. On average each year, Saint Simons Island experiences 129 days above 25 °C (77.0 °F) and 0 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Saint Simons Island, Georgia, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 23°C
(73°F)		 21°C
(71°F)		 24°C
(76°F)		 28°C
(82°F)		 30°C
(86°F)		 31°C
(89°F)		 32°C
(89°F)		 31°C
(89°F)		 32°C
(90°F)		 30°C
(86°F)		 27°C
(80°F)		 22°C
(72°F)
Mean maximum 20°C
(68°F)		 20°C
(68°F)		 22°C
(73°F)		 25°C
(77°F)		 28°C
(82°F)		 29°C
(85°F)		 31°C
(87°F)		 31°C
(87°F)		 30°C
(87°F)		 28°C
(82°F)		 24°C
(75°F)		 21°C
(70°F)
Average high 15°C
(59°F)		 16°C
(61°F)		 18°C
(65°F)		 21°C
(71°F)		 25°C
(77°F)		 27°C
(81°F)		 29°C
(84°F)		 28°C
(84°F)		 28°C
(82°F)		 25°C
(78°F)		 20°C
(68°F)		 16°C
(62°F)
Daily mean 13°C
(55°F)		 14°C
(58°F)		 16°C
(62°F)		 20°C
(68°F)		 23°C
(74°F)		 26°C
(79°F)		 27°C
(82°F)		 27°C
(82°F)		 27°C
(80°F)		 24°C
(75°F)		 18°C
(65°F)		 15°C
(59°F)
Average low 11°C
(52°F)		 13°C
(55°F)		 15°C
(59°F)		 18°C
(65°F)		 22°C
(72°F)		 25°C
(77°F)		 26°C
(80°F)		 26°C
(80°F)		 25°C
(78°F)		 23°C
(73°F)		 16°C
(62°F)		 13°C
(55°F)
Mean minimum 3°C
(38°F)		 7°C
(45°F)		 7°C
(44°F)		 12°C
(53°F)		 17°C
(63°F)		 22°C
(72°F)		 25°C
(77°F)		 24°C
(76°F)		 22°C
(72°F)		 15°C
(59°F)		 10°C
(50°F)		 6°C
(43°F)
Minimum 0°C
(33°F)		 4°C
(40°F)		 5°C
(41°F)		 9°C
(48°F)		 15°C
(59°F)		 20°C
(68°F)		 24°C
(76°F)		 24°C
(76°F)		 19°C
(66°F)		 11°C
(51°F)		 5°C
(41°F)		 3°C
(37°F)

Compare climate in Saint Simons Island with other places

Compare temperature, precipitation, sunshine, UV index in Saint Simons Island, Georgia, United States with other places around the world.

Monthly average precipitation in Saint Simons Island, Georgia, United States §

Saint Simons Island usually has the most precipitation in July, August and September, with an average of 16 rainy days and 146 mm (5.7 inches) of precipitation per month.The driest months in Saint Simons Island are January, March and May. On average, 62 mm (2.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Saint Simons Island, Georgia, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 61 (2.4) 93 (3.6) 60 (2.4) 78 (3.1) 65 (2.6) 103 (4.1) 136 (5.3) 136 (5.4) 166 (6.5) 82 (3.2) 99 (3.9) 121 (4.8)
Average precipitation days (≥ 1 mm) 6 11 6 7 8 14 16 19 15 11 7 10

Monthly sunshine hours in Saint Simons Island, Georgia, United States §

The sunniest months in Saint Simons Island are May, July and August, when the sun shines an average of 10 hours 49 minutes a day.Least sunny months in Saint Simons Island: January, February and December receive an average of 7 hours 8 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Saint Simons Island, Georgia, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 198 220 296 312 337 317 346 322 302 295 247 231
Mean daily daylight hours 10h 22m 11h 4m 12h 0m 12h 56m 13h 44m 14h 7m 13h 54m 13h 12m 12h 18m 11h 22m 10h 33m 10h 8m

Solar UV radiation in Saint Simons Island, Georgia, United States §

Saint Simons Island experiences the highest level of ultraviolet (UV) radiation in May, July and August, when the maximum UV index can reach values of 11 - 11, which corresponds to the Extreme category of sun exposure.January, November and December are in the Moderate / High exposure category. In these months, the maximum values of the UV index do not exceed 6. For more detailed information, check out our hourly Saint Simons Island UV Index data.

Average daily maximum UV levels by month for Saint Simons Island, Georgia, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 5 7 9 10 11 11 11 11 10 8 6 4