Hilton Head Island Weather in May

May offers excellent weather for Hilton Head Island in South Carolina. Warm temperatures along with the lightest rainfall of the year make the vacation destination particularly appealing in May.

This page gives detailed information on the typical May 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

82 °F May average high 28 °C
63 °F May average low 17 °C

In most years, Hilton Head Island averages a daily maximum temperature for May that's between 80 and 84 degrees Fahrenheit (27 to 29 degrees Celsius). The minimum temperature usually falls between 60 and 65 °F (16 to 19 °C).

The days at Hilton Head Island warm steadily during May. By the end of the month, the temperature has climbed around 5 °F (3 °C) above what it was at the start.

21 days 80 °F max. or more (27 °C)
10 days 60 °F min. or less (16 °C)

Usually every day during May the temperature rises to over 70 °F (21 °C) at Hilton Head. The Island averages one or two days this month when the thermometer reaches into the 90s °F (over 32 °C). Temperatures above 100 °F (38 °C) are not expected here during May.

The thermometer dips to 50 °F (10 °C) or below on an average of one night this month. But May does not normally get as cold as 40 °F (4 °C).

Rainy Weather iconRain

2.0 in total precipitation 50 mm
6 days of rain

May is the least rainy month for Hilton Head Island. Half the time, the beach town receives 0.2 to 3 inches (4 to 74 mm) of rainfall in May. One in four years has drier weather, while another one in four is wetter.

Sunny Weather iconSun

68 % sunshine
9 days clear skies

The sun's rays reach the ground in Hilton Head Island during 68 percent of daylight hours on average in May, for a total of 291 hours in the month. Typically on 9 days this month the sky is mainly clear, with at most 30 percent cloud cover.

Sunlight in May at the island resort lasts for 13 hours and 49 minutes a day on average. The shortest day of the month is the 1st with 13 hours and 27 minutes of daylight. By the end of the month, the days have lengthened to 14:07 from sunrise to sunset. These durations can vary by a minute or two from year to year.

Humid Weather iconHumidity

70 % May average humidity

The relative humidity in Hilton Head Island during May usually peaks at 87 percent in the morning then drops to 50 percent by early afternoon.

Local Time1 am4 am7 am10 am1 pm4 pm7 pm10 pm
Humidity % 84 87 85 61 50 52 63 78

Stormy Weather iconStorms

2 days rainfall of 0.5 inches (13 mm) or more

Heavy rainstorms are less common in May than other months.


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.

Hilton Head Island Weather
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