Climateby Month

St. Simons Island, GA climate by month

NOAA 1991-2020 normals · 10 ft elevation

Summers in St. Simons Island are hot and oppressively humid; winters are cool. Highs peak at 91°F in July and fall to 62°F in January. The wettest month is August (about 13 wet days) and the driest is April (about 7). Snow is rare. The most comfortable time to visit is March, April and November.

Warmest month
91°F
July normal high
Coldest month
44°F
January normal low
Wet days a year
105
45.4 in of precipitation
Muggy days a year
163
dew point 65°F or higher

How warm is St. Simons Island?

Normal highs range from 62°F in January to 91°F in July.

40°50°60°70°80°90°100° January: normal high 62°F (17°C), low 44°F (7°C) 62° 44° February: normal high 65°F (18°C), low 47°F (8°C) March: normal high 70°F (21°C), low 53°F (12°C) April: normal high 76°F (24°C), low 60°F (16°C) May: normal high 83°F (28°C), low 68°F (20°C) June: normal high 88°F (31°C), low 74°F (23°C) July: normal high 91°F (33°C), low 76°F (24°C) 91° 76° August: normal high 90°F (32°C), low 76°F (24°C) September: normal high 86°F (30°C), low 73°F (23°C) October: normal high 79°F (26°C), low 64°F (18°C) November: normal high 71°F (22°C), low 53°F (12°C) December: normal high 64°F (18°C), low 47°F (8°C) JFMAMJJASOND

Bars run from the normal low to the normal high for each month.

How rainy is St. Simons Island?

August has the most wet days (about 13); the year brings about 45 in of precipitation.

January: 8 wet days February: 8 wet days March: 8 wet days April: 7 wet days 7 May: 7 wet days June: 11 wet days July: 11 wet days August: 13 wet days 13 September: 11 wet days October: 8 wet days November: 7 wet days December: 8 wet days JFMAMJJASOND

Wet day: at least 0.01 in of rain or melted snow, counted from daily records 1991-2020.

How humid is St. Simons Island?

Muggy days peak in August, at about 31 days.

January: 0 muggy days 0 February: 0 muggy days March: 1 muggy days April: 6 muggy days May: 18 muggy days June: 28 muggy days July: 31 muggy days August: 31 muggy days 31 September: 26 muggy days October: 15 muggy days November: 4 muggy days December: 1 muggy days JFMAMJJASOND

Muggy day: daily mean dew point of 65°F or higher, from hourly observations 1991-2020 at Malcolm Mc Kinnon Airport, 1.2 mi N of the city center.

How much daylight?

Daylight ranges from about 10.2 hours in December to 14.1 hours in June.

January: 10.4 hours of daylight February: 11.1 hours of daylight March: 12.0 hours of daylight April: 12.9 hours of daylight May: 13.7 hours of daylight June: 14.1 hours of daylight 14.1 July: 13.9 hours of daylight August: 13.3 hours of daylight September: 12.3 hours of daylight October: 11.4 hours of daylight November: 10.6 hours of daylight December: 10.2 hours of daylight 10.2 JFMAMJJASOND
See all numbers
Monthly climate normals and day counts for St. Simons Island, 1991-2020
MonthHighLowPrecip.Wet daysMuggy daysDaylight
January 62°F44°F 3.1 in8 0 10.4 h
February 65°F47°F 2.8 in8 0 11.1 h
March 70°F53°F 3.3 in8 1 12.0 h
April 76°F60°F 2.8 in7 6 12.9 h
May 83°F68°F 2.3 in7 18 13.7 h
June 88°F74°F 5.8 in11 28 14.1 h
July 91°F76°F 4.2 in11 31 13.9 h
August 90°F76°F 5.8 in13 31 13.3 h
September 86°F73°F 6.0 in11 26 12.3 h
October 79°F64°F 4.7 in8 15 11.4 h
November 71°F53°F 1.9 in7 4 10.6 h
December 64°F47°F 2.8 in8 1 10.2 h

High and low: NOAA 1991-2020 normal daily high and low. Wet days: at least 0.01 in of rain or melted snow. Muggy days: daily mean dew point 65°F or higher.

Best months to visit St. Simons Island

By our comfort score, the best months are March, April and November.

Comfort score by month (0-100) and its parts, in days per month
MonthScoreComfortableNotable rainHot or cold
Jan 56950
Feb 611050
Mar 671450
Apr 671250
May 56443
Jun 45089
Jul 410717
Aug 400913
Sep 45184
Oct 59950
Nov 651430
Dec 561050

Score = 40 × share of comfortable days + 25 × share of days without notable rain + 20 × share of days neither hot (90°F+) nor cold (high 40°F or below) + 15 × daylight. How the score works.

Frost dates in St. Simons Island

The last spring frost typically comes around Feb 9, and the first fall frost around Dec 26, leaving 312 frost-free days in a typical year.

Frost and freeze dates for St. Simons Island
Typical date1 year in 10
Last spring frost (32°F)Feb 9after Mar 6
First fall frost (32°F)Dec 26before Nov 30
Last hard freeze (28°F)Jan 27after Feb 26
First hard freeze (28°F)Jan 8before Dec 13
Frost-free season312 daysunder 279 days

"Typical" is the date with a 50% chance of a later spring frost (or earlier fall frost). Planting after the "1 year in 10" spring date gives a 90% chance of no further frost. The Old Farmer's Almanac publishes 30% dates, which fall between our typical and 1-in-10 dates.

Station: Brunswick Malcolm Mckinnon Airport (USW00013878), NOAA 1991-2020 freeze probabilities. Frost dates for every city in Georgia.

Hottest and coldest readings, 1991-2020

The highest reading was 103°F (July 20, 2000); the lowest was 16°F (February 5, 1996).

From the temperature station's daily records with NOAA quality flags removed. Not an all-time record.

Near St. Simons Island

Similar climates elsewhere

Where the numbers come from

  • Temperature, rain, frost dates and humidity and wind by hour: Brunswick Malcolm Mckinnon Airport (USW00013878), 1.2 mi N of the city center, 16 ft . NOAA normals and daily records, 1991-2020.
  • Snowfall: Brunswick (USC00091340), 7.0 mi WNW of the city center, 13 ft . NOAA normals and daily records, 1991-2020.
  • Snow depth: Sapelo Is (USC00097808), 19 mi NNE of the city center, 10 ft . NOAA normals and daily records, 1991-2020.
  • Daily humidity and wind: Malcolm Mc Kinnon Airport (722137-13878), 1.2 mi N of the city center, 14 ft . Hourly observations, 1991-2020.
  • Not available for this location: cloud cover (no station close enough or similar enough in elevation).

Distances from the city center (USGS). Methodology · Report an error