August 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 August

The last month of the summer, August, is also a hot month in Hilton Head Island, South Carolina, with an average temperature varying between 87.1°F (30.6°C) and 77.5°F (25.3°C).

Temperature

In Hilton Head Island, the average high-temperature in August is relatively the same as in July - a still hot 87.1°F (30.6°C). The average low-temperature, in Hilton Head Island, is 77.5°F (25.3°C).

Heat index

In August, the average heat index is evaluated at a sweltering 100.4°F (38°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
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 'apparent temperature', 'feels like', 'felt air temperature', or 'real feel', combines air temperature and relative humidity to represent a human perceived temperature equivalent. This effect is individual, with diverse people perceiving weather differently for numerous reasons (metabolic differences, wind, differences in body mass, height, and shape), and activity. Be aware that direct exposure to sunlight increases heat impact and may raise the 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. Excessive warmth is eliminated from the body by evaporation of sweat. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. 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

In August, the average relative humidity in Hilton Head Island is 76%.

Rainfall

The month with the most rainfall in Hilton Head Island is August, when the rain falls for 25 days and typically aggregates up to 6.06" (154mm) of precipitation.

Snowfall

February through December are months without snowfall.

Ocean temperature

With an average ocean temperature of 83.5°F (28.6°C), August is the month with the warmest seawater in Hilton Head Island.
Note: 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.

Daylight

In Hilton Head Island, the average length of the day in August is 13h and 18min.
On the first day of August, sunrise is at 6:37 am and sunset at 8:20 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 7:49 pm EDT.

Sunshine

In Hilton Head Island, the average sunshine in August is 10.8h.

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 health risk from unsafe exposure to UV radiation for the ordinary person.
Note: The daily maximum UV index of 7 in August interpret into the following advice:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. 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. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.
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FAQ

What is the temperature in August in Hilton Head Island?

In Hilton Head Island, South Carolina, in August, the average high-temperature is 87.1°F (30.6°C), and the average low-temperature is 77.5°F (25.3°C). in August, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which combines air temperature and relative humidity, is evaluated at 100.4°F (38°C).

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

In August, the average relative humidity is 76%.

What is the wettest month in Hilton Head Island?

The month with the most rainfall in Hilton Head Island is August, when the rain falls for 25 days and typically aggregates up to 6.06" (154mm) of precipitation.

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

In Hilton Head Island, during August, the rain falls for 25 days and regularly aggregates up to 6.06" (154mm) of precipitation.

When it does not snow in Hilton Head Island?

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

What is the month with the warmest ocean in Hilton Head Island?

With an average ocean temperature of 83.5°F (28.6°C), August is the month with the warmest seawater in Hilton Head Island.

What is the water temperature in August in Hilton Head Island?

In August, the average ocean temperature in Hilton Head Island, South Carolina, is 83.5°F (28.6°C). 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.

How many hours of daylight does Hilton Head Island have in August?

In August, the average day length in Hilton Head Island, South Carolina, is 13h and 18min.

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

On the first day of August in Hilton Head Island, sunrise is at 6:37 am and sunset at 8:20 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 7:49 pm EDT.

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

In Hilton Head Island, South Carolina, the average sunshine duration in August is 10.8h.

When is the highest UV index in Hilton Head Island?

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

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

In August, the average daily maximum UV index is 7. A UV Index of 6 to 7 symbolizes a high health threat from exposure to the Sun's 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 August
Hilton Head Island, SC

Average temperature in August - Hilton Head Island, SC
  • Average high temperature in August: 87.1°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 August: 77.5°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 August
Hilton Head Island, SC

Average pressure in August - Hilton Head Island, SC
  • Average pressure in August: 29.98"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 August
Hilton Head Island, SC

Average wind speed in August - Hilton Head Island, SC
  • Average wind speed in August: 7.8mph

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 August
Hilton Head Island, SC

Average humidity in August - Hilton Head Island, SC
  • Average humidity in August: 76%

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 August
Hilton Head Island, SC

Average rainfall in August - Hilton Head Island, SC
  • Average rainfall in August: 6.06"

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 August
Hilton Head Island, SC

Average rainfall days in August - Hilton Head Island, SC
  • Average rainfall days in August: 25 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 August
Hilton Head Island, SC

Average snowfall in August - Hilton Head Island, SC
  • Average snowfall in August: 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 August
Hilton Head Island, SC

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

Average sea temperature in August - Hilton Head Island, SC
  • Average sea temperature in August: 83.5°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 August /
Average sunshine in August
Hilton Head Island, SC

Average daylight in August / Average sunshine in August - Hilton Head Island, SC
  • Average daylight in August: 13h and 18min

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 August: 10h and 48min

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 August
Hilton Head Island, SC

Average sunshine days in August - Hilton Head Island, SC
  • Average sunshine days in August: 2.8 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 August
Hilton Head Island, SC

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

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

Average visibility in August - Hilton Head Island, SC
  • Average visibility in August: 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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