July 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 July

July sets in with the continuation of the hot summer season on Hilton Head Island, accompanied by increased humidity and rainy spells. Its temperatures are somewhat similar to June, with July marginally warmer. The mix of hot weather, humid air, and frequent showers exemplify typical tropical summer weather patterns. Despite the rainfall, sunny days and warm sea water create an ultimate summer beach experience in July. According to the available data, temperature averages swing between a high of 87.6°F (30.9°C) and a low of 77.9°F (25.5°C), making it the hottest month of the year.

Temperature

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

Heat index

July's average heat index is appraised at a fiery hot 102.2°F (39°C). Implement additional safety measures to avoid heat cramps and heat exhaustion. Persistent activity might trigger heatstroke.
Know that the heat index computations account for shaded terrains and slight winds. The heat index could experience an increase of 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is a metric representing the sensation of warmth when air temperature and moisture come together. Factors such as metabolic variations, being pregnant, and physical activity can impact an individual's weather perception. Under direct sun rays, the felt temperature might be heightened, with the heat index increasing by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Juveniles are regularly less conscious of the need to recuperate and rehydrate. Thirst is a tardy symptom of dehydration - hydration, especially during lengthy physical activities, should be maintained.
When faced with excessive heat, the human body begins to perspire, utilizing the cooling benefits of sweat evaporation. In circumstances of high air temperature and humidity (high heat index), the body's perspiration is restricted, heightening the feeling of warmth. Potential thermal conditions emerge as the body's heat gain outpaces its cooling mechanisms.

Humidity

In July, the average relative humidity in Hilton Head Island is 75%.

Rainfall

In Hilton Head Island, during July, the rain falls for 23.4 days and regularly aggregates up to 4.17" (106mm) of precipitation. Throughout the year, there are 175.3 rainfall days, and 32.28" (820mm) of precipitation is accumulated.

Snowfall

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

Ocean temperature

In Hilton Head Island, the average seawater temperature in July is 83.1°F (28.4°C).
Note: For any water activity, surface water temperatures from 77°F (25°C) to 84.2°F (29°C) are deemed perfect and extremely pleasing for enduring enjoyment.

Daylight

In July, the average length of the day in Hilton Head Island 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 8:20 pm EDT.

Sunshine

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

UV index

May through August, with an average maximum UV index of 7, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: A maximum UV index of 7 in July translates into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. Avoid exposure to the Sun and try to stay in the shade between 10 a.m. and 4 p.m., when UV radiation is most potent, but be aware that parasols or canopies may not offer full protection. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Caution! The Sun's UV rays become stronger due to reflections from water and sand.
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Frequently asked questions

What part of the year is the hottest in Hilton Head Island?

July, recognised by an average high temperature of 87.6°F (30.9°C) and a low of 77.9°F (25.5°C), is Hilton Head Island's warmest month.

How hot is July in Hilton Head Island?

The average high-temperature, in July, in Hilton Head Island, 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', 'feels like'), which combines air temperature and relative humidity, in July is appraised at 102.2°F (39°C).

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

In Hilton Head Island, the average relative humidity in July is 75%.

How much does it rain in Hilton Head Island in July?

In Hilton Head Island, South Carolina, during July, the rain falls for 23.4 days and regularly aggregates up to 4.17" (106mm) of precipitation.

When it does not snow in Hilton Head Island?

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

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

In Hilton Head Island, the average seawater temperature in July is 83.1°F (28.4°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.

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

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 8:20 pm EDT.

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

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

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

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

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 in Hilton Head Island.

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

In July, 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.
Today
Tomorrow
Long-term
YearJFMAMJJulyASOND
Jun
July
Aug
Average high temperature
85.6°F 29.8°C
87.6°F 30.9°C
87.1°F 30.6°C
Average low temperature
75.6°F 24.2°C
77.9°F 25.5°C
77.5°F 25.3°C
Average pressure
29.98" 761mmHg
30" 762mmHg
29.98" 761mmHg
Average wind speed
8.3mph 13.4km/h
8.4mph 13.5km/h
7.8mph 12.6km/h
Average max. wind speed
8.9mph 14.3km/h
8.9mph 14.3km/h
8.5mph 13.7km/h
Average wind speed gusts
12.7mph 20.4km/h
12.6mph 20.3km/h
11.9mph 19.2km/h
Average humidity
75%
75%
76%
Average rainfall
3.94" 100mm
4.17" 106mm
6.06" 154mm
Average rainfall days
21.2
23.4
25
Average snowfall
0" 0mm
0" 0mm
0" 0mm
Average snowfall days
0
0
0
Average sea temperature
79.2°F 26.2°C
83°F 28.3°C
83.5°F 28.6°C
Average daylight
14h 1min
14h 0min
13h 2min
Average sunshine
11h 0min
11h 0min
10h 5min
Average sunshine days
6.8
4.5
2.8
Average UV index
7
7
7
Average cloud cover
25%
25%
27%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

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).

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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).

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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).

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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%).

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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").

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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).

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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").

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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).

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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).

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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 0min

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 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).

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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).

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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).

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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).

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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).

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Hilton Head Island, South Carolina, USA

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