Contents
- Weather in July
- Frequently asked questions
- Average temperature in July
- Average pressure in July
- Average wind speed in July
- Average humidity in July
- Average rainfall in July
- Average rainfall days in July
- Average snowfall days in July
- Average daylight in July
- Average sunshine in July
- Average sunshine days in July
- Average UV index in July
- Average cloud cover in July
- Average visibility in July
Weather in July
Temperature
In Sullivan's Island, the month of July registers the highest temperatures, averaging 86.5°F (30.3°C) at the peak and 78.3°F (25.7°C) at the lowest.Heat index
July's average heat index is appraised at a very hot 98.6°F (37°C). Exercise special caution, heat exhaustion and heat cramps are probable. Prolonged activity may induce heatstroke.One should consider that heat index numbers are for shaded settings and light wind. The heat index may experience an enhancement of 15 Fahrenheit (8 Celsius) degrees under direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'feels like', gauges the sensation of temperature factoring in the air's moisture content. The impression of weather on a person can be swayed by additional aspects, including metabolic variations, pregnancy, and activity levels. Being under direct sunshine can magnify the heat experience, possibly pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for children. Young ones are generally more prone to risk than adults due to their reduced ability to sweat. Their large skin surface area relative to their diminutive bodies and elevated heat production from their activities further enhance this risk.
The physiological way the human body responds to excessive heat is by inducing perspiration, using sweat evaporation as a cooling mechanism. Increased relative humidity slows down evaporation, thereby decreasing the rate of heat removal from the body, culminating in a sensation of overheating. 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 July, the average relative humidity is 76%.Rainfall
In Sullivan's Island, in July, during 24.4 rainfall days, 5.67" (144mm) of precipitation is typically accumulated. Throughout the year, there are 182 rainfall days, and 45.55" (1157mm) of precipitation is accumulated.Snowfall
In Sullivan's Island, snow does not fall in March through December.Daylight
In Sullivan's Island, the average length of the day in July is 14h and 4min.On the first day of the month, sunrise is at 6:15 am and sunset at 8:31 pm. On the last day of July, sunrise is at 6:33 am and sunset at 8:18 pm EDT.
Sunshine
The month with the most sunshine is 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 threat to health from exposure to the Sun's UV radiation for average individuals.Note: The daily maximum UV index of 7 in July interprets into the following advice:
Implement preventive steps and embrace sun safety standards. Protection from skin and eye distress is compulsory. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is at its strongest, and remember that parasols or canopies do not offer full protection. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What time of the year is the hottest?
How hot does it get in July?
What is the average humidity in July?
How many days does it rain in July?
When it does not snow in Sullivan's Island?
What is the average length of the day in July?
What time are sunrise and sunset in July?
What month has the most sunshine?
How many hours of sunshine does Sullivan's Island have in July?
When is the highest UV index?
What is the UV index reading in July?
Average temperature in July
Sullivan's Island, SC
- Average high temperature in July: 86.5°F
The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is January (57°F).
- Average low temperature in July: 78.3°F
The month with the highest average low temperature is July (78.3°F).
The coldest month (with the lowest average low temperature) is January (45.5°F).
Average pressure in July
Sullivan's Island, SC
- Average pressure in July: 30"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).
Average wind speed in July
Sullivan's Island, SC
- Average wind speed in July: 9.1mph
The windiest months (with the highest average wind speed) are March and April (10.3mph).
The calmest month (with the lowest average wind speed) is August (8.4mph).
Average humidity in July
Sullivan's Island, SC
- Average humidity in July: 76%
The month with the highest relative humidity is December (78%).
The months with the lowest relative humidity are January and March (73%).
Average rainfall in July
Sullivan's Island, SC
- Average rainfall in July: 5.67"
The wettest month (with the highest rainfall) is August (8.23").
The driest month (with the least rainfall) is January (1.42").
Average rainfall days in July
Sullivan's Island, SC
- Average rainfall days in July: 24.4 days
The month with the highest number of rainy days is August (25.9 days).
The month with the least rainy days is November (8.5 days).
Average snowfall days in July
Sullivan's Island, SC
- Average snowfall days in July: 0 days
The month with the highest number of snowfall days is January (0.3 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in July /
Average sunshine in July
Sullivan's Island, SC
- Average daylight in July: 14h and 1min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in July: 11h and 0min
The month with the most sunshine is July (Average sunshine: 11h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).
Average sunshine days in July
Sullivan's Island, SC
- Average sunshine days in July: 4.1 days
The month with the most sunshine days is January (19.3 days).
The month with the least sunshine days is August (2.8 days).
Average UV index in July
Sullivan's 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
Sullivan's Island, SC
- Average cloud cover in July: 26
The month with the most cloud cover is December (Cloud cover 39).
The month with the least cloud cover is June (Cloud cover 25).
Average visibility in July
Sullivan's 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).
Sullivan's Island, South Carolina, USA
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