Hilton Head Island Weather Averages

Most days at Hilton Head Island in South Carolina have moderately warm temperatures. The beach resort receives its driest and sunniest weather in spring. Then during summer both rainfall and humidity increase .

This page gives detailed information on the annual weather averages for Hilton Head Island.

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Temperature Precipitation Sun Humidity Storms

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

76 °F	annual average high	24 °C
57 °F	annual average low	14 °C

Hilton Head Island's coldest days of the year usually occur in late December and early January when the daily maximum temperature averages 60 degrees Fahrenheit (15 degrees Celsius). The coldest nights arrive in mid January with a minimum temperature averaging 40 °F (4 °C).

The year's hottest days are normally in mid July. The average temperature peaks then with daily highs of 90 °F (32 °C) and nighttime lows of 74 °F (23 °C).

152 days	80 °F max. or more (27 °C)
118 days	50 °F min. or less (10 °C)

Most days at Hilton Head Island have a temperature of over 50 °F (10 °C). The Island averages 32 days a year when the thermometer reaches into the 90s °F (over 32 °C). It doesn't get as hot as 100 °F (38 °C) here every year.

The thermometer dips below freezing on an average of 17 nights a year. Hilton Head Island gets as cold as 10 °F (-12 °C) about once a decade.

Precipitation

50.3 in	total precipitation	1278 mm
100 days	of rainfall

August is usually the wettest month of the year at Hilton Head Island, while May is the driest.

Sun

62 %	sunshine
104 days	clear skies

The sun's rays reach the ground in Hilton Head Island during 62 percent of daylight hours on average year round, for a total of 2755 hours annually. Typically on 104 days a year the sky is mainly clear, with at most 30 percent cloud cover.

Sunlight at the resort town averages 12 hours and 10 minutes a day. The shortest days of the year in mid December have 10 hours and 2 minutes of daylight. The year's longest days in mid June last 14:16 from sunrise to sunset.

Humidity

72 %	average humidity

The annual average for relative humidity in Hilton Head Island ranges throughout the day from 86 percent at 7:00 am to 54 percent at 1:00 pm standard time.

Local Time	1 am	4 am	7 am	10 am	1 pm	4 pm	7 pm	10 pm
Humidity %	83	85	86	66	54	54	68	79

Storms

16 days	precipitation of 1 inch (25 mm) or more
4 %	chance a named storm makes landfall

In any year, there's a 3 percent probability that a hurricane will reach land in Beaufort county, which includes Hilton Head Island. For major hurricanes of category 3 to 5, the likelihood drops to 1 percent. Named storms usually arrive during the months of June to November, while hurricanes are generally restricted to August, September and October.

The chances that a wind gust reaches 40 miles per hour (64 kilometres an hour) or greater is 24 percent a year. Intense hurricane force winds that top 115 mph (185 kph) have a 2 percent probability of blasting the county.