July Weather in Charleston, United States

Last updated: June 24, 2025

In July, the average temperature in Charleston, United States reaches a warm 28°C (82°F). Expect daily variations, with temperatures dipping as low as 17°C (62°F) and soaring to a maximum of 41°C (105°F). Rainfall contributes about 87 mm (3.4 in) over approximately 10 days, while the average humidity hovers around 75%, creating a noticeably tropical atmosphere.

July Temperature in Charleston

In July in Charleston, the average temperature is 28°C (82°F), with maximums reaching up to 41°C (105°F) and minimums dropping as low as 17°C (62°F). This makes it an ideal time to visit for those who enjoy warm weather, but travelers should be prepared for the heat during the day.

July Weather in Charleston: Daily Temperature Highs, Lows, and Averages

The chart illustrates July temperature patterns in Charleston, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Charleston, July typically has an average temperature of 28°C (82°F), with highs reaching up to 41°C (105°F) and lows dropping to around 17°C (62°F).

Data source: Temperature data for Charleston generated using information from the Copernicus Climate Change Service.

July Precipitation in Charleston

In Charleston in July, the precipitation amount is 87 mm (3.4 in) over the course of 10 days.

July Precipitation Trends in Charleston

The chart displays monthly precipitation patterns in Charleston, with values for each month alongside July’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how July’s conditions compare to those of other months. In Charleston, July typically receives around 87 mm (3.4 inches) of precipitation spread over approximately 10 days.

Data source: Precipitation data for July generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

July Humidity in Charleston

In Charleston in July humidity is 75%. With an average temperature of 28°C (82°F), this humidity feels like a warm, enveloping embrace that can quickly leave travelers feeling sticky and fatigued. It can make outdoor activities challenging, as sweat doesn’t evaporate easily, leading to a constant struggle between comfort and the desire to explore.

July Average Humidity in Charleston

This chart illustrates the average monthly humidity levels in Charleston, with July’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In July, average humidity in Charleston is approximately 75%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for July generated using information from the Copernicus Climate Change Service.

July UV Index in Charleston

In Charleston in July, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Charleston.

Maximum UV Index Levels in Charleston for July

The chart shows the monthly maximum UV Index (UVI) for Charleston in July, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In July, the maximum UV index in Charleston typically reaches 11, which falls under the extreme exposure category.

Data source: Charleston July UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How July Weather in Charleston Compares to Other Months

Weather in Charleston varies notably across the year, with each month offering distinct climate conditions. This page compares July’s weather to other months in Charleston, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Charleston, showing how July’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	5°C (41°F)	80 mm (3.1 inches)	82%	moderate
February Weather	7°C (45°F)	116 mm (4.6 inches)	79%	high
March Weather	13°C (55°F)	131 mm (5.1 inches)	77%	very high
April Weather	16°C (61°F)	161 mm (6.3 inches)	78%	very high
May Weather	21°C (70°F)	197 mm (7.8 inches)	82%	extreme
June Weather	26°C (78°F)	109 mm (4.3 inches)	81%	extreme
July Weather	28°C (82°F)	87 mm (3.4 inches)	75%	extreme
August Weather	27°C (80°F)	125 mm (4.9 inches)	61%	very high
September Weather	25°C (76°F)	59 mm (2.3 inches)	59%	very high
October Weather	17°C (64°F)	113 mm (4.5 inches)	69%	high
November Weather	10°C (51°F)	76 mm (3.0 inches)	82%	moderate
December Weather	8°C (47°F)	90 mm (3.5 inches)	87%	moderate