July weather forecastCharleston International Airport, SC
July
Weather in July
July, in the heart of summer, boasts the highest temperatures of the year for Charleston International Airport. The mercury reaches a scorching 86°F (30°C) at the peak, making it the warmest month in the calendar. This month enjoys long daylight hours, sharing a striking balance with shorter nights. The UV index, as a constant companion of the sunny weather, also scales new heights. July also presents the heaviest rainfall, requiring residents to brace for potential sudden showers amidst the sweltering heat.Temperature
July temperatures tend to peak at an average high of 86°F (30°C) and dip to a low of 64.4°F (18°C).Rainfall
The month with the most rainfall in Charleston International Airport is July, when the rain falls for 13 days and typically aggregates up to 4.84" (123mm) of precipitation.Daylight
In July, the average length of the day is 14h and 4min.On the first day of the month, sunrise is at 6:15 am and sunset at 8:32 pm. On the last day of July, in Charleston International Airport, sunrise is at 6:33 am and sunset at 8:19 pm EDT.
Sunshine
The months with the most sunshine are May through August, with an average of 8h of sunshine.UV index
The months with the highest UV index are June through August, with an average maximum UV index of 9. A UV Index reading of 8 to 10 represents a very high health risk from exposure to the Sun's UV rays for ordinary individuals.Note: The UV index of 9 during July leads to these advisories:
Protection should always be a priority. Skin and eyes are vulnerable without it. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Stay sun-safe with clothing that is both closely woven and worn loosely. Even under cloud cover, use sunscreen with at least an SPF 30 generously and reapply frequently post every swim or outdoor exercise.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in July
Charleston International Airport, SC
- Average high temperature in July: 86°F
The warmest month (with the highest average high temperature) is July (86°F).
The month with the lowest average high temperature is January (41°F).
- Average low temperature in July: 64°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (23°F).
Average rainfall in July
Charleston International Airport, SC
- Average rainfall in July: 4.8"
The wettest month (with the highest rainfall) is July (4.8").
The driest month (with the least rainfall) is October (2.8").
Average rainfall days in July
Charleston International Airport, SC
- Average rainfall days in July: 13 days
The month with the highest number of rainy days is January (15 days).
The months with the least rainy days are September and October (10 days).
Average daylight in July /
Average sunshine in July
Charleston International Airport, SC
- Average daylight in July: 14h and 6min
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: 8h
The months with the most sunshine are May, June, July and August (Average sunshine: 8h).
The month with the least sunshine is December (Average sunshine: 3h).
Average UV index in July
Charleston International Airport, SC
- Average UV index in July: 9
The months with the highest UV index are June, July and August (UV index 9).
The months with the lowest UV index are January and December (UV index 2).
