July weather forecastHilton Head Island, SC
July
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.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
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).
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).
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%).
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").
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).
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").
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).
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).
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).
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).
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).
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).
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).
