Hilton Head Island, SC weather in August
August in Hilton Head Island: hot and oppressively humid, with frequent rain. Highs 90°F, lows 74°F, about 13 days with rain. This is the peak of the warm season in Hilton Head Island.
- Normal high
- 90°F
- Normal low
- 74°F
- Wet days
- 13
- 6.5 in total
- Muggy days
- 30
- dew point 65°F+
How August changes from start to finish
| August 1 | August 31 | |
|---|---|---|
| Normal high | 92°F | 89°F |
| Normal low | 75°F | 73°F |
| Chance of a wet day | 42% | 40% |
| Sunrise / sunset | 6:38 am / 8:20 pm | 6:57 am / 7:49 pm |
| Daylight | 13.7 h | 12.9 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 am75°Fdew point 72°F
- 9 am82°Fdew point 73°F
- Noon87°Fdew point 73°F
- 3 pm88°Fdew point 73°F
- 6 pm84°Fdew point 73°F
- 9 pm80°Fdew point 74°F
NOAA hourly normals (local standard time) from Beaufort MCAS (19 mi away); average wind 5 mph; clear or few clouds in 28% of daytime hours, mostly cloudy or overcast in 47%.
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 more19 of 31
- Muggy daysdaily mean dew point 65°F or more30 of 31
- Wet daysat least 0.01 in of rain or melted snow13 of 31
- Notable rainat least 0.10 in8 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 6.5 in; a dry August brings about 4.9 in and a wet one about 7.8 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, 1991-20202007: average high 93°F
- Coolest August1996: average high 87°F
- Wettest August1995: 14.7 in
- Driest August1994: 1.1 in
- Highest reading103°F (August 7, 2008)
- Lowest reading61°F (August 8, 2004)
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 | 92°F | 90°F | 86°F |
| Normal low | 75°F | 74°F | 70°F |
| Wet days | 13 | 13 | 10 |
| Comfortable days | 0 | 0 | 2 |
| Daylight | 14.0 h | 13.3 h | 12.4 h |
Highs change by -2°F from July and -4°F into September.
Nearby alternatives in August
- Drier: Athens, GA193 mi · high 90°F · 10 wet days
How Hilton Head Island ranks in August
- Normal high128th warmest of 378 cities; 2nd of 5 in South Carolina
- Wet days331st driest of 378
- Comfortable days312th most of 341
What to pack for Hilton Head Island in August
- Light, breathable clothing – highs near 90°F and about 30 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 533 cooling degree days (base 65°F), 12% of the year's total heating and cooling demand.
Questions
How hot is Hilton Head Island in August?
The normal high is 90°F and the normal low is 74°F. From 1991 to 2020 the hottest August reading was 103°F (most recently on August 7, 2008).
Does it rain a lot in Hilton Head Island in August?
About 13 days in August have at least 0.01 in of precipitation, and the normal total is 6.5 in. The wettest August in 1991-2020 was in 1995 (14.7 in); the driest was in 1994 (1.1 in).
Is August a good time to visit Hilton Head Island?
August ranks 11th of 12 months on our comfort score for Hilton Head Island (37 out of 100). It has almost no comfortable days and about 19 days at 90°F or hotter. The best months are March and April.
Where the numbers come from
- Temperature, rain, frost dates, humidity and wind by hour and cloud cover: Beaufort MCAS (USW00093831), 19 mi N of the city center, 37 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Beaufort MCAS (722085-93831), 19 mi N of the city center, 37 ft . Hourly observations, 1991-2020.
- Not available for this location: snowfall and snow depth (no station close enough or similar enough in elevation).