May weather forecast
Hilton Head Island, SC

Tall iconic lighthouse seen in a great night view over downtown Hilton Head Island, South Carolina
Tall iconic lighthouse seen in a great night view over downtown Hilton Head Island, South Carolina

Weather in May

May, the last month of the spring in Hilton Head Island, is a warm month, with temperature in the range of an average high of 79.2°F (26.2°C) and an average low of 68.9°F (20.5°C).

Temperature

In Hilton Head Island, South Carolina, the average high-temperature in May slightly increases from a pleasant 72.9°F (22.7°C) in April to a warm 79.2°F (26.2°C). The average low-temperature, in Hilton Head Island, is 68.9°F (20.5°C).

Humidity

In May, the average relative humidity is 75%.

Rainfall

In Hilton Head Island, during May, the rain falls for 15.3 days and regularly aggregates up to 2.09" (53mm) of precipitation. In Hilton Head Island, during the entire year, the rain falls for 175.3 days and collects up to 32.28" (820mm) of precipitation.

Snowfall

February through December are months without snowfall.

Ocean temperature

In Hilton Head Island, South Carolina, in May, the average water temperature is 72.3°F (22.4°C).
Note: A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 72.3°F (22.4°C) water. (FYI: The Olympic swimming competition requires a water temperature between 77°F (25°C) and 82.4°F (28°C).)

Daylight

In Hilton Head Island, the average length of the day in May is 13h and 49min.
On the first day of the month, sunrise is at 6:36 am and sunset at 8:03 pm. On the last day of May, in Hilton Head Island, sunrise is at 6:17 am and sunset at 8:24 pm EDT.

Sunshine

In May, the average sunshine is 10.6h.

UV index

The months with the highest UV index are May through August, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high threat to health from unsafe exposure to UV radiation for ordinary individuals.
Note: The daily maximum UV index of 7 in May interpret into the following advice:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.
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FAQ

What is the temperature in May in Hilton Head Island?

In Hilton Head Island, in May, the average high-temperature is 79.2°F (26.2°C), and the average low-temperature is 68.9°F (20.5°C).

What is the average humidity in May in Hilton Head Island?

In May, the average relative humidity in Hilton Head Island, South Carolina, is 75%.

How many days does it rain in May in Hilton Head Island?

In Hilton Head Island, South Carolina, in May, during 15.3 rainfall days, 2.09" (53mm) of precipitation is typically accumulated.

When it does not snow in Hilton Head Island?

February through December are months without snowfall in Hilton Head Island, South Carolina.

What is the ocean temperature in May in Hilton Head Island?

In Hilton Head Island, the average seawater temperature in May is 72.3°F (22.4°C). A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 72.3°F (22.4°C) water.

What is the average length of the day in May in Hilton Head Island?

The average day length in May in Hilton Head Island is 13h and 49min.

What time are sunrise and sunset in May in Hilton Head Island?

In May, on the first day of the month, sunrise is at 6:36 am and sunset at 8:03 pm. On the last day of the month, sunrise is at 6:17 am and sunset at 8:24 pm EDT.

How long on average sun shines in May in Hilton Head Island?

In May, the average sunshine duration is 10.6h.

When is the highest UV index in Hilton Head Island?

The months with the highest UV index in Hilton Head Island are May through August, with an average maximum UV index of 7.

What is the UV index intensity in May in Hilton Head Island?

In May, the average daily maximum UV index in Hilton Head Island, South Carolina, is 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Hilton Head Island, SC

Average temperature in May - Hilton Head Island, SC
  • Average high temperature in May: 79.2°F

The warmest month (with the highest average high temperature) is July (87.6°F).
The month with the lowest average high temperature is January (57.4°F).

  • Average low temperature in May: 68.9°F

The month with the highest average low temperature is July (77.9°F).
The coldest month (with the lowest average low temperature) is January (46°F).

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Average pressure in May
Hilton Head Island, SC

Average pressure in May - Hilton Head Island, SC
  • Average pressure in May: 30.03"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The months with the lowest atmospheric pressure are June and August (29.98"Hg).

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Average wind speed in May
Hilton Head Island, SC

Average wind speed in May - Hilton Head Island, SC
  • Average wind speed in May: 9mph

The windiest months (with the highest average wind speed) are January, March and April (9.6mph).
The calmest month (with the lowest average wind speed) is August (7.8mph).

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Average humidity in May
Hilton Head Island, SC

Average humidity in May - Hilton Head Island, SC
  • Average humidity in May: 75%

The month with the highest relative humidity is December (77%).
The month with the lowest relative humidity is January (72%).

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Average rainfall in May
Hilton Head Island, SC

Average rainfall in May - Hilton Head Island, SC
  • Average rainfall in May: 2.09"

The wettest month (with the highest rainfall) is August (6.06").
The driest month (with the least rainfall) is January (1.02").

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Average rainfall days in May
Hilton Head Island, SC

Average rainfall days in May - Hilton Head Island, SC
  • Average rainfall days in May: 15.3 days

The month with the highest number of rainy days is August (25 days).
The month with the least rainy days is January (8.3 days).

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Average snowfall in May
Hilton Head Island, SC

Average snowfall in May - Hilton Head Island, SC
  • Average snowfall in May: 0"

The month with the highest snowfall is January (0.04").
The months with the least snowfall are February, March, April, May, June, July, August, September, October, November and December (0").

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Average snowfall days in May
Hilton Head Island, SC

Average snowfall days in May - Hilton Head Island, SC
  • Average snowfall days in May: 0 days

The months with the highest number of snowfall days are January and February (0.1 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October, November and December (0 days).

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Average sea temperature in May
Hilton Head Island, SC

Average sea temperature in May - Hilton Head Island, SC
  • Average sea temperature in May: 72.4°F

The best month for swimming (with the highest average sea temperature) is August (83.5°F).
The coldest month (with the lowest average sea temperature) is February (57.5°F).

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Average daylight in May /
Average sunshine in May
Hilton Head Island, SC

Average daylight in May / Average sunshine in May - Hilton Head Island, SC
  • Average daylight in May: 13h and 49min

The month with the longest days is June (Average daylight: 14h and 14min).
The month with the shortest days is December (Average daylight: 10h and 5min).

  • Average sunshine in May: 10h and 36min

The months with the most sunshine are June and July (Average sunshine: 11h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).

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Average sunshine days in May
Hilton Head Island, SC

Average sunshine days in May - Hilton Head Island, SC
  • Average sunshine days in May: 13.2 days

The month with the most sunshine days is January (20.3 days).
The month with the least sunshine days is August (2.8 days).

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Average UV index in May
Hilton Head Island, SC

Average UV index in May - Hilton Head Island, SC
  • Average UV index in May: 7

The months with the highest UV index are May, June, July and August (UV index 7).
The month with the lowest UV index is January (UV index 3).

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Average cloud cover in May
Hilton Head Island, SC

Average cloud cover in May - Hilton Head Island, SC
  • Average cloud cover in May: 27

The months with the most cloud cover are February and December (Cloud cover 38).
The months with the least cloud cover are June and July (Cloud cover 25).

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Average visibility in May
Hilton Head Island, SC

Average visibility in May - Hilton Head Island, SC
  • Average visibility in May: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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