nomadseason

August Weather in Charleston, United States

Last updated: June 24, 2025

In August, the average temperature in Charleston, United States reaches a warm 27°C (80°F). Visitors can expect a minimum temperature of 16°C (62°F) and a maximum soaring up to 38°C (101°F). With an average humidity of 61%, the climate can feel quite warm and humid. Additionally, be prepared for 125 mm (4.9 in) of precipitation spread over 11 days, making it wise to carry an umbrella as you explore!

August Temperature in Charleston

In August in Charleston, the average temperature is 27°C (80°F). Maximum temperatures can reach up to 38°C (101°F), while minimums can drop to as low as 16°C (62°F). This climate makes Charleston a great destination for travelers looking to enjoy 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 27°C (80°F), with highs reaching up to 38°C (101°F) and lows dropping to around 16°C (62°F).
JanFebMarAprMayJunJulAugSepOctNovDec414555607078828076635146
Data source: Temperature data for Charleston generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

August Precipitation in Charleston

In Charleston in August, the precipitation amount is 125 mm (4.9 in) over the course of 11 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 125 mm (4.9 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec8011613116119710987125591137690
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

August Humidity in Charleston

In Charleston in August, humidity is 61%. With an average temperature of 27°C (80°F), this humidity feels like a warm embrace, making travel feel slightly sultry but manageable, adding a touch of heaviness to the air that invites you to explore the local culture at a leisurely pace.

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 61%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%79%77%78%82%81%75%61%59%69%82%88%
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.
JanFebMarAprMayJunJulAugSepOctNovDec46810111111109754
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.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)80 mm (3.1 inches)82%moderate
February Weather7°C (45°F)116 mm (4.6 inches)79%high
March Weather13°C (55°F)131 mm (5.1 inches)77%very high
April Weather16°C (61°F)161 mm (6.3 inches)78%very high
May Weather21°C (70°F)197 mm (7.8 inches)82%extreme
June Weather26°C (78°F)109 mm (4.3 inches)81%extreme
July Weather28°C (82°F)87 mm (3.4 inches)75%extreme
August Weather27°C (80°F)125 mm (4.9 inches)61%very high
September Weather25°C (76°F)59 mm (2.3 inches)59%very high
October Weather17°C (64°F)113 mm (4.5 inches)69%high
November Weather10°C (51°F)76 mm (3.0 inches)82%moderate
December Weather8°C (47°F)90 mm (3.5 inches)87%moderate

Compare Charleston's Climate with Cities Worldwide