The highest day temperature in May 2023 was 92°F. The lowest night temperature was 56°F. The average values for day and night temperatures during May were 78.8°F и 66.0°F respectivly.

The average sea surface temperature in May 2023 for Hilton Head Island was 76.7°F. The maximum and minimum values were 71.8°F and 80.6°F respectively.

Most of the days in May are cloudy but you can also expect sunny or gloomy days.

Precipitation total in May for Hilton Head Island is 1.2 in. It makes may one of the least rainy months of the year.

The average wind speed in May is 7.0 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Hilton Head Island in May is 8.2 hours.