August weather forecast
Hilton Head Island, SC

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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

Hilton Head Island's weather in August is marked by a confluence of intense heat and substantial rainfall, making it the wettest month of the year. The temperature scale remains akin to July, indicating ongoing summer madness. Although the rainfall intensifies compared to July, it does little to dampen the high temperatures, resulting in increased humidity. Keeping the showers aside, warm sea temperatures and long sunlight hours crowns August with an exotic beach vibe. This month showcases a slight dip in temperature, with averages ranging from 87.1°F (30.6°C) to 77.5°F (25.3°C).

Temperature

Hilton Head Island's average high-temperature in August sits at a still tropical 87.1°F (30.6°C), showing little difference from the previous month. August brings an average low-temperature of 77.5°F (25.3°C) to Hilton Head Island.

Heat index

The heat index in August is appraised at a sweltering 100.4°F (38°C). Heightened safety actions are necessary, heat cramps and heat exhaustion are probable. Persistent activity may lead to heatstroke.
Keep in mind the heat index values are meant for areas in shade and with light wind. Being exposed to direct sunshine might trigger a heat index increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is a single figure representing how weather conditions feel when combining temperature and humidity. An individual's perception of weather can be swayed by a variety of elements including metabolic differences, pregnancy status, and their level of physical exertion. Be mindful that being in direct sunlight might mean feeling hotter, with the heat index rising by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.
The natural cooling mechanism in humans involves perspiration, where the evaporation of sweat balances out excessive warmth. When relative humidity increases, the body's capacity to evaporate heat decreases, leading to a heightened sense of warmth. Potential thermal conditions emerge as the body's heat gain outpaces its cooling mechanisms.

Humidity

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

Rainfall

August is the month with the most rainfall. Rain falls for 25 days and accumulates 6.06" (154mm) of precipitation.

Snowfall

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

Ocean temperature

With an average ocean temperature of 83.5°F (28.6°C), August is the month with the warmest seawater.
Note: Swimming, diving, and other water endeavors at temperatures between 77°F (25°C) and 84.2°F (29°C) are considered enjoyable and satisfying for extended periods without discomfort.

Daylight

In August, the average length of the day is 13h and 18min.
On the first day of August in Hilton Head Island, sunrise is at 6:38 am and sunset at 8:20 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 7:48 pm EDT.

Sunshine

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

UV index

May through August, with an average maximum UV index of 7, are months with the highest UV index in Hilton Head Island. A UV Index reading of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The daily high UV index of 7 in August translates into this advice:
Embrace precautions and observe sun safety norms. Evasion of sunburn is a necessity. The Sun's UV radiation is most intense from 10 a.m. to 4 p.m. Try to avoid direct sun exposure during these hours. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Beware! Reflecting off water and sand, UV rays are much stronger.

Frequently asked questions

How hot does it get in Hilton Head Island in August?

In Hilton Head Island, 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). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which combines relative humidity and air temperature, in August is appraised at 100.4°F (38°C).

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

The average relative humidity in August is 76%.

What is the rainiest month in Hilton Head Island?

August is the month with the most rainfall. Rain falls for 25 days and accumulates 6.06" (154mm) of precipitation.

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

In Hilton Head Island, South Carolina, in August, during 25 rainfall days, 6.06" (154mm) of precipitation is typically accumulated.

When it does not snow in Hilton Head Island?

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

What month is the ocean warmest in Hilton Head Island?

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

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

In Hilton Head Island, the average seawater temperature in August is 83.5°F (28.6°C). For any water activity, surface water temperatures between 77°F (25°C) and 84.2°F (29°C) are considered as excellent and extremely pleasant for lengthened periods.

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

In August, the average day length 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, South Carolina, sunrise is at 6:38 am and sunset at 8:20 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 7:48 pm EDT.

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

In August, the average sunshine duration is 10.8h.

When is the highest UV index in Hilton Head Island?

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

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

In August, the average daily maximum UV index in Hilton Head Island is 7. A UV Index estimate of 6 to 7 represents a high health risk from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
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).

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).

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).

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%).

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").

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).

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").

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).

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).

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 2min

The month with the longest days is June (Average daylight: 14h and 12min).
The month with the shortest days is December (Average daylight: 10h and 6min).

  • Average sunshine in August: 10h and 5min

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).

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).

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).

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).

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).

Hilton Head Island, South Carolina, USA

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