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August Weather in Charleston, United States

Last updated: June 24, 2025

In Charleston, United States, the average temperature in August is a pleasant 24°C (75°F). Visitors can expect a minimum of 11°C (53°F) and a maximum of 34°C (94°F). During this time, the region typically experiences 123 mm (4.8 in) of precipitation spread over 11 days, coupled with an average humidity of 82%. Whether you’re planning outdoor activities or cozy indoor time, this month offers a delightful mix of warm weather and refreshing rain.

August Temperature in Charleston

In August in Charleston, the average temperature is 24°C (75°F), with maximums reaching up to 34°C (94°F) and minimums dropping as low as 11°C (53°F). This pleasant climate makes it an ideal time for outdoor activities and exploring the local attractions.

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 24°C (75°F), with highs reaching up to 34°C (94°F) and lows dropping to around 11°C (53°F).
JanFebMarAprMayJunJulAugSepOctNovDec303344536675787471584237
Data source: Temperature data for Charleston generated using information from the Copernicus Climate Change Service.
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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 123 mm (4.8 in) occurring 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 123 mm (4.8 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec7879125117135110116123671158965
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Charleston

In Charleston in August, humidity is 82%. With an average temperature of 24°C (75°F), this humidity feels like a warm embrace, making travel feel sticky and heavy on the skin, often requiring more frequent breaks and hydration.

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 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%84%83%80%83%82%83%79%79%88%87%
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 is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910111098643
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 Weather-1°C (30°F)78 mm (3.1 inches)84%moderate
February Weather1°C (33°F)79 mm (3.1 inches)82%moderate
March Weather7°C (44°F)125 mm (4.9 inches)84%high
April Weather12°C (53°F)117 mm (4.6 inches)83%very high
May Weather19°C (66°F)135 mm (5.3 inches)80%very high
June Weather24°C (76°F)110 mm (4.3 inches)83%extreme
July Weather25°C (78°F)116 mm (4.6 inches)82%very high
August Weather24°C (75°F)123 mm (4.8 inches)82%very high
September Weather21°C (71°F)67 mm (2.6 inches)79%very high
October Weather14°C (58°F)115 mm (4.5 inches)79%high
November Weather6°C (42°F)89 mm (3.5 inches)88%moderate
December Weather3°C (37°F)65 mm (2.6 inches)87%moderate

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