July 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 July

July in Hilton Head Island, South Carolina, is a tropical summer month, with temperature in the range of an average high of 87.6°F (30.9°C) and an average low of 77.9°F (25.5°C).

Temperature

With an average high-temperature of 87.6°F (30.9°C) and an average low-temperature of 77.9°F (25.5°C), July is the warmest month.

Heat index

In July, the average heat index is estimated at a sweltering 102°F (38.9°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'feels like', 'felt air temperature', or 'apparent temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. Additional factors like activity, pregnancy, metabolic differences, and differences in body mass, height, and shape affect individual temperature impact. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

The average relative humidity in July is 75%.

Rainfall

In Hilton Head Island, it is raining for 23.4 days, with typically 4.17" (106mm) of accumulated 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

In Hilton Head Island, South Carolina, snow does not fall in February through December.

Ocean temperature

In July, the average ocean temperature in Hilton Head Island is 83.1°F (28.4°C).
Note: For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

Daylight

In Hilton Head Island, the average length of the day in July is 14h and 1min.
On the first day of the month, sunrise is at 6:20 am and sunset at 8:33 pm. On the last day of July, in Hilton Head Island, sunrise is at 6:37 am and sunset at 8:21 pm EDT.

Sunshine

June and July, with an average of 11h of sunshine, are months with the most sunshine in Hilton Head Island.

UV index

The months with the highest UV index in Hilton Head Island, South Carolina, are May through August, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: In July, the average maximum UV index of 7 translate into the following recommendations:
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. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.
[Resources]

FAQ

What is the warmest month in Hilton Head Island?

July is the warmest month in Hilton Head Island, South Carolina, with an average high-temperature of 87.6°F (30.9°C) and an average low-temperature of 77.9°F (25.5°C).

What is the temperature in July in Hilton Head Island?

The average high-temperature, in July, is 87.6°F (30.9°C), while the average low-temperature is 77.9°F (25.5°C). The average heat index (a.k.a. 'real feel', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, in July is estimated at 102°F (38.9°C).

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

The average relative humidity in July in Hilton Head Island, South Carolina, is 75%.

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

In July, in Hilton Head Island, South Carolina, the rain falls for 23.4 days. Throughout July, 4.17" (106mm) of precipitation is accumulated.

When it does not snow in Hilton Head Island?

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

How warm is the water in July in Hilton Head Island?

In Hilton Head Island, South Carolina, in July, the average water temperature is 83.1°F (28.4°C). Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

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

The average day length in July in Hilton Head Island, South Carolina, is 14h and 1min.

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

In July, on the first day of the month, sunrise is at 6:20 am and sunset at 8:33 pm. On the last day of the month, in Hilton Head Island, sunrise is at 6:37 am and sunset at 8:21 pm EDT.

What are the months with the most sunshine in Hilton Head Island?

The months with the most sunshine are June and July, with an average of 11h of sunshine.

How many hours of sunshine does Hilton Head Island have in July?

In Hilton Head Island, the average sunshine duration in July is 11h.

What is the month with the highest UV index in Hilton Head Island?

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

How high is the UV index in July in Hilton Head Island?

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

Average temperature in July
Hilton Head Island, SC

Average temperature in July - Hilton Head Island, SC
  • Average high temperature in July: 87.6°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 July: 77.9°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).

[Resources]

Average pressure in July
Hilton Head Island, SC

Average pressure in July - Hilton Head Island, SC
  • Average pressure in July: 30"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).

[Resources]

Average wind speed in July
Hilton Head Island, SC

Average wind speed in July - Hilton Head Island, SC
  • Average wind speed in July: 8.4mph

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).

[Resources]

Average humidity in July
Hilton Head Island, SC

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

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

[Resources]

Average rainfall in July
Hilton Head Island, SC

Average rainfall in July - Hilton Head Island, SC
  • Average rainfall in July: 4.17"

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

[Resources]

Average rainfall days in July
Hilton Head Island, SC

Average rainfall days in July - Hilton Head Island, SC
  • Average rainfall days in July: 23.4 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).

[Resources]

Average snowfall in July
Hilton Head Island, SC

Average snowfall in July - Hilton Head Island, SC
  • Average snowfall in July: 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").

[Resources]

Average snowfall days in July
Hilton Head Island, SC

Average snowfall days in July - Hilton Head Island, SC
  • Average snowfall days in July: 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).

[Resources]

Average sea temperature in July
Hilton Head Island, SC

Average sea temperature in July - Hilton Head Island, SC
  • Average sea temperature in July: 83°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).

[Resources]

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

Average daylight in July / Average sunshine in July - Hilton Head Island, SC
  • Average daylight in July: 14h and 1min

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 July: 11h and 0min

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).

[Resources]

Average sunshine days in July
Hilton Head Island, SC

Average sunshine days in July - Hilton Head Island, SC
  • Average sunshine days in July: 4.5 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).

[Resources]

Average UV index in July
Hilton Head Island, SC

Average UV index in July - Hilton Head Island, SC
  • Average UV index in July: 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).

[Resources]

Average cloud cover in July
Hilton Head Island, SC

Average cloud cover in July - Hilton Head Island, SC
  • Average cloud cover in July: 25

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).

[Resources]

Average visibility in July
Hilton Head Island, SC

Average visibility in July - Hilton Head Island, SC
  • Average visibility in July: 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).

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location