St. Simons Island, GA weather in August
In August, St. Simons Island sees highs around 90°F and lows around 76°F: hot and oppressively humid, with frequent rain. Expect about 13 wet days. It is one of the warmest months in St. Simons Island.
- Normal high
- 90°F
- Normal low
- 76°F
- Wet days
- 13
- 5.8 in total
- Muggy days
- 31
- dew point 65°F+
How August changes from start to finish
| August 1 | August 31 | |
|---|---|---|
| Normal high | 91°F | 88°F |
| Normal low | 77°F | 75°F |
| Chance of a wet day | 40% | 41% |
| Sunrise / sunset | 6:42 am / 8:21 pm | 7:01 am / 7:50 pm |
| Daylight | 13.6 h | 12.8 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Eastern Time).
A typical August day
- 6 am77°Fdew point 73°F
- 9 am82°Fdew point 74°F
- Noon87°Fdew point 74°F
- 3 pm86°Fdew point 74°F
- 6 pm83°Fdew point 74°F
- 9 pm80°Fdew point 74°F
NOAA hourly normals (local standard time) from Brunswick Malcolm Mckinnon Airport (1 mi away); average wind 8 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F0 of 31
- Beach dayshigh 80-95°F, under 0.05 in of rain, afternoon wind under 15 mph19 of 31
- Hot dayshigh 90°F or more13 of 31
- Muggy daysdaily mean dew point 65°F or more31 of 31
- Wet daysat least 0.01 in of rain or melted snow13 of 31
- Notable rainat least 0.10 in9 of 31
- Freezing nightslow 32°F or below0 of 31
Average days per August, counted from daily records for each year 1991-2020.
Rain in August
Normal precipitation is 5.8 in; a dry August brings about 4.3 in and a wet one about 7.0 in (25th and 75th percentiles). About 4 days bring half an inch or more, and about 2 an inch or more.
How August varies from year to year
- Warmest August, 1991-20202011: average high 93°F
- Coolest August1992: average high 86°F
- Wettest August1995: 12.6 in
- Driest August2003: 1.2 in
- Highest reading101°F (August 11, 2011)
- Lowest reading67°F (August 21, 1991)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
August compared with July and September
| July | August | September | |
|---|---|---|---|
| Normal high | 91°F | 90°F | 86°F |
| Normal low | 76°F | 76°F | 73°F |
| Wet days | 11 | 13 | 11 |
| Comfortable days | 0 | 0 | 1 |
| Daylight | 13.9 h | 13.3 h | 12.3 h |
Highs change by -1°F from July and -4°F into September.
Nearby alternatives in August
- Drier: Macon, GA176 mi · high 92°F · 10 wet days
How St. Simons Island ranks in August
- Normal high139th warmest of 378 cities; 6th of 8 in Georgia
- Wet days335th driest of 378
- Comfortable days297th most of 341
What to pack for St. Simons Island in August
- Light, breathable clothing – highs near 90°F and about 31 muggy days
- A rain jacket or umbrella – rain on about 13 days
- A swimsuit – about 19 beach days
Heating and cooling
August has 0 heating degree days and 550 cooling degree days (base 65°F), 13% of the year's total heating and cooling demand.
Questions
How hot is St. Simons Island in August?
The normal high is 90°F and the normal low is 76°F. From 1991 to 2020 the hottest August reading was 101°F (August 11, 2011).
Does it rain a lot in St. Simons Island in August?
About 13 days in August have at least 0.01 in of precipitation, and the normal total is 5.8 in. The wettest August in 1991-2020 was in 1995 (12.6 in); the driest was in 2003 (1.2 in).
Is August a good time to visit St. Simons Island?
August ranks 12th of 12 months on our comfort score for St. Simons Island (40 out of 100). It has almost no comfortable days and about 13 days at 90°F or hotter. The best months are March, April and November.
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).