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). Daily highs can soar up to 36°C (97°F), while nighttime lows dip to a comfortable 18°C (64°F). With an average humidity of 80% and 112 mm (4.4 in) of precipitation spread over 13 days, be prepared for a mix of warmth and moisture during your stay!

July Temperature in Charleston

In July in Charleston, the average temperature is 28°C (82°F). Maximum temperatures can reach 36°C (97°F), while minimums can drop to as low as 18°C (64°F). This makes it an ideal time for travelers seeking warm weather and pleasant conditions.

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 36°C (97°F) and lows dropping to around 18°C (64°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 112 mm (4.4 in) over the course of 13 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 112 mm (4.4 inches) of precipitation spread over approximately 13 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 80%. With an average temperature of 28°C (82°F), this humidity feels like a warm, thick blanket enveloping you, making outdoor activities sweaty and demanding frequent breaks in the shade while traveling.

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 80%, 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	7°C (45°F)	120 mm (4.7 inches)	84%	moderate
February Weather	10°C (49°F)	195 mm (7.7 inches)	83%	high
March Weather	14°C (58°F)	168 mm (6.6 inches)	80%	very high
April Weather	17°C (63°F)	149 mm (5.9 inches)	82%	very high
May Weather	22°C (73°F)	115 mm (4.5 inches)	83%	extreme
June Weather	26°C (79°F)	134 mm (5.3 inches)	80%	extreme
July Weather	28°C (82°F)	112 mm (4.4 inches)	80%	extreme
August Weather	27°C (81°F)	124 mm (4.9 inches)	75%	very high
September Weather	25°C (78°F)	100 mm (3.9 inches)	73%	very high
October Weather	19°C (67°F)	113 mm (4.5 inches)	76%	high
November Weather	11°C (53°F)	84 mm (3.3 inches)	84%	high
December Weather	10°C (50°F)	143 mm (5.6 inches)	88%	moderate