Hilton Head Island Weather in July

July's weather is the hottest of the year at Hilton Head Island, South Carolina. Still, most days at the beach vacation town get no hotter than 90 degrees Fahrenheit (32 °Celsius).

This page gives detailed information on the typical July 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

89 °F July average high 32 °C
74 °F July average low 23 °C

In most years, Hilton Head Island averages a daily maximum temperature for July that's between 88 and 91 degrees Fahrenheit (31 to 33 degrees Celsius). The minimum temperature usually falls between 72 and 75 °F (22 to 24 °C).

July is Hilton Head Island's hottest month overall, with temperatures peaking on the 16th. That date has a daily high averaging 89.6 °F (32.0 °C) and low of 73.7 °F (23.2 °C).

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

Usually every day during July has a temperature of over 80 °F (27 °C) at Hilton Head. This is the month most likely to have temperatures into the 100s °F (over 38 °C), but that doesn't happen every year.

July only gets as cold as 60 °F (16 °C) a couple of times a decade.

Rainy Weather iconRain

6.3 in total precipitation 160 mm
10 days of rain

Half the time, Hilton Head Island receives 5 to 8 inches (135 to 201 mm) of rainfall in July. One in four years has drier weather, while another one in four is wetter.

Sunny Weather iconSun

64 % sunshine
6 days clear skies

The sun's rays reach the ground in Hilton Head Island during 64 percent of daylight hours on average in July, for a total of 278 hours in the month. Typically on 6 days this month the sky is mainly clear, with at most 30 percent cloud cover.

Sunlight in July at the vacation destination lasts for 14 hours a day on average. The longest day of the month is the 1st with 14 hours and 13 minutes of daylight. By the end of the month, the days have shortened to 13:43 from sunrise to sunset. These durations can vary by a minute or two from year to year.

Humid Weather iconHumidity

76 % July average humidity

The relative humidity in Hilton Head Island during July usually peaks at 90 percent in the morning then drops to 58 percent by early afternoon.

Local Time1 am4 am7 am10 am1 pm4 pm7 pm10 pm
Humidity % 88 90 89 68 58 61 72 83

Stormy Weather iconStorms

4 days rainfall of 0.5 inches (13 mm) or more
6 % chance a named storm approaches

There's a 6 percent probability that a named tropical storm will approach within 100 miles (165 km) of Hilton Head Island during July, and a 2 percent chance of a category 1 or 2 hurricane. Major hurricanes are unlikely this time of year.


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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