Hilton Head Island Weather in August

August's weather is less comfortable than other summer months at Hilton Head Island, South Carolina. This is the rainiest and most humid time of the year for the vacation town.

This page gives detailed information on the typical August weather for Hilton Head Island. The temperature and rainfall numbers here are historical averages based on climate data gathered at Hilton Head Island. The humidity and sunshine measurements are averages from the Savannah / Hilton Head International Airport.

Temperature Weather iconTemperature

88 °F August average high 31 °C
73 °F August average low 23 °C

In most years, Hilton Head Island averages a daily maximum temperature for August that's between 87 and 90 degrees Fahrenheit (30 to 32 degrees Celsius). The minimum temperature usually falls between 72 and 74 °F (22 to 23 °C).

The days at Hilton Head Island begin to cool during August. By the end of the month, the temperature has dropped around 2 °F (1 °C) below what it was at the start.

9 days 90 °F max. or more (32 °C)
5 days 70 °F min. or less (21 °C)

Usually every day during August has a temperature of over 80 °F (27 °C) at Hilton Head. Temperatures above 100 °F (38 °C) are not expected here this month.

Every few years August briefly gets as cold as 60 °F (16 °C).

Rainy Weather iconRain

7.6 in total precipitation 194 mm
12 days of rain

Half the time, Hilton Head Island receives 5 to 9 inches (127 to 230 mm) of rainfall in August. One in four years has drier weather, while another one in four is wetter. This is normally the rainiest month for the resort town.

Sunny Weather iconSun

62 % sunshine
6 days clear skies

The sun's rays reach the ground in Hilton Head Island during 62 percent of daylight hours on average in August, for a total of 255 hours in the month. Typically on 6 days this month the sky is mainly clear, with at most 30 percent cloud cover.

Sunlight in August at the island town lasts for 13 hours and 17 minutes a day on average. The longest day of the month is the 1st with 13 hours and 42 minutes of daylight. By the end of the month, the days have shortened to 12:51 from sunrise to sunset. These durations can vary by a minute or two from year to year.

Humid Weather iconHumidity

79 % August average humidity

The relative humidity in Hilton Head Island during August usually peaks at 92 percent in the morning then drops to 61 percent by early afternoon. This is the most humid month for Hilton Head Island.

Local Time1 am4 am7 am10 am1 pm4 pm7 pm10 pm
Humidity % 90 92 91 71 61 64 76 86

Stormy Weather iconStorms

5 days rainfall of 0.5 inches (13 mm) or more
8 % chance a named storm approaches

Heavy rainstorms occur more frequently during August than any other month. There's a 2 percent probability that a hurricane will approach within 100 miles (165 km) of Hilton Head Island during August. The chance of a major hurricane (category 3 to 5) reaching the area is 1 percent.


These weather data are long-term historical averages provided by the National Climatic Data Center of the United States. The temperature and precipitation numbers are 1981-2010 normals while the humidity statistics are 1961-1990 normals. The named storm probabilities come from the Atlantic Oceanographic and Meteorological Laboratory, Hurricane Research Division.

Hilton Head Island Weather
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