Annual mean 21°C · wettest around August · prevailing wind E
Warmest
31.8 °C
Coldest
14.9 °C
Wettest
32%
Windiest
4.6 m/s
Prevailing
E
3.9 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in St. Simons over the whole year is 21°C. July is the hottest month, with highs of about 32°C; January is the coldest, with lows of about 9°C. St. Simons has no sharply defined rainy season: the chance of rain on a given day runs from 25% in October, the driest month, to 29% in August, the wettest. Winds in St. Simons are highest in April, averaging 3.2 m/s (12 km/h), and lightest in August, at 2.5 m/s (9 km/h). The prevailing wind is from the E. The clearest skies in St. Simons come in July, when the sky is typically 31% covered; December is the cloudiest month, at 46%.
Month by month St. Simons climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
15°C
9°C
12°C
25%
39%
2.8 m/s
35
5
64
February
19°C
12°C
16°C
25%
44%
2.9 m/s
57
12
66
March
21°C
13°C
19°C
26%
36%
3.1 m/s
65
18
63
April
24°C
17°C
22°C
26%
33%
3.2 m/s
74
36
48
May
28°C
21°C
28°C
27%
33%
3.0 m/s
42
63
16
June
30°C
24°C
32°C
28%
36%
2.9 m/s
10
52
2
July
32°C
26°C
35°C
28%
31%
2.6 m/s
2
26
0
August
31°C
25°C
34°C
29%
37%
2.5 m/s
3
32
0
September
29°C
23°C
31°C
27%
41%
2.7 m/s
18
57
5
October
26°C
19°C
26°C
25%
40%
2.8 m/s
55
51
29
November
21°C
14°C
19°C
26%
45%
2.8 m/s
62
20
62
December
17°C
11°C
15°C
27%
46%
2.7 m/s
49
8
68
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short St. Simons weather by season
Year round, St. Simons has days of about 15°C at their warmest in January, its coolest month, and 32°C in July, its warmest; the coolest hours of the day run from 9°C to 26°C through the year, and the average temperature over the year is 21°C around the clock. Rain is most likely around August and least likely around October. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
St. Simons weather in winterDecember to February
High 17°CLow 10°CRain 26%
Winter in St. Simons has typical daily highs of about 17°C and lows of about 10°C, with a 26% chance of rain on a given day.
St. Simons weather in springMarch to May
High 24°CLow 17°CRain 26%
Spring in St. Simons has typical daily highs of about 24°C and lows of about 17°C, with a 26% chance of rain on a given day.
St. Simons weather in summerJune to August
High 31°CLow 25°CRain 28%
Summer in St. Simons has typical daily highs of about 31°C and lows of about 25°C, with a 28% chance of rain on a given day.
St. Simons weather in autumnSeptember to November
High 25°CLow 19°CRain 26%
Autumn in St. Simons has typical daily highs of about 25°C and lows of about 19°C, with a 26% chance of rain on a given day.
When is the rainy season in St. Simons?
St. Simons has no sharply defined rainy season: the chance of rain on a given day runs from 25% in October, the driest month, to 29% in August, the wettest.
What time of year is St. Simons windiest?
Winds in St. Simons are highest in April, averaging 3.2 m/s (12 km/h), and lightest in August, at 2.5 m/s (9 km/h). The prevailing wind is from the E.
What is the average temperature in St. Simons year round?
The average temperature in St. Simons over the whole year is 21°C. July is the hottest month, with highs of about 32°C; January is the coldest, with lows of about 9°C.