August Weather in Charleston, United States

Last updated: June 24, 2025

The average temperature in Charleston, United States during August typically hovers around 26°C (78°F), with a pleasant range from a minimum of 15°C (60°F) to a maximum of 35°C (95°F). Visitors can expect about 126 mm (5.0 in) of precipitation spread over roughly 14 days, contributing to a significant average humidity of 76%. Perfect for those who enjoy a warm, tropical climate!

August Temperature in Charleston

In August in Charleston, the average temperature is 26°C (78°F), with maximums reaching 35°C (95°F) and minimums dropping as low as 15°C (60°F). This pleasant climate makes Charleston an ideal destination for travelers seeking warm weather and outdoor activities.

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

The chart illustrates August 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, August typically has an average temperature of 26°C (78°F), with highs reaching up to 35°C (95°F) and lows dropping to around 15°C (60°F).

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

August Precipitation in Charleston

In Charleston in August, the precipitation amount is 126 mm (5.0 in) over a span of 14 days.

August Precipitation Trends in Charleston

The chart displays monthly precipitation patterns in Charleston, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Charleston, August typically receives around 126 mm (5.0 inches) of precipitation spread over approximately 14 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

August Humidity in Charleston

In Charleston in August humidity is 76%. With an average temperature of 26°C (78°F), this humidity feels like a warm, tropical embrace, making travel feel like a stroll through a steamy rainforest, where the air clings to your skin and every step can leave you drenched, yet there's a certain charm in the lush scenery and vibrant life all around.

August Average Humidity in Charleston

This chart illustrates the average monthly humidity levels in Charleston, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Charleston is approximately 76%, offering insight into how humid the weather typically is during this month.

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

August UV Index in Charleston

In Charleston in August, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Charleston.

Maximum UV Index Levels in Charleston for August

The chart shows the monthly maximum UV Index (UVI) for Charleston in August, 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 August, the maximum UV index in Charleston typically reaches 10, which falls under the very high exposure category.

Data source: Charleston August 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 August 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 August’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 August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	6°C (43°F)	94 mm (3.7 inches)	86%	moderate
February Weather	9°C (48°F)	165 mm (6.5 inches)	86%	high
March Weather	12°C (54°F)	157 mm (6.2 inches)	86%	very high
April Weather	16°C (61°F)	149 mm (5.9 inches)	82%	very high
May Weather	21°C (71°F)	111 mm (4.4 inches)	85%	extreme
June Weather	24°C (76°F)	99 mm (3.9 inches)	85%	extreme
July Weather	27°C (80°F)	103 mm (4.1 inches)	83%	extreme
August Weather	26°C (78°F)	126 mm (5.0 inches)	76%	very high
September Weather	24°C (75°F)	94 mm (3.7 inches)	76%	very high
October Weather	18°C (65°F)	124 mm (4.9 inches)	80%	high
November Weather	10°C (51°F)	75 mm (2.9 inches)	88%	high
December Weather	8°C (47°F)	129 mm (5.1 inches)	88%	moderate