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August Weather in Charleston, United States

Last updated: June 24, 2025

In Charleston, United States, the average temperature in August hovers around 25°C (77°F), making it an inviting destination. However, be prepared for temperature fluctuations, as the minimum can dip to 15°C (60°F) while the maximum can soar up to 35°C (95°F). This month also brings about 126 mm (5.0 in) of precipitation spread over 14 days, resulting in an average humidity of 65%. Pack accordingly for a comfortable visit!

August Temperature in Charleston

In August in Charleston, the average temperature is 25°C (77°F). Maximum temperatures can reach 35°C (95°F), while the minimum can drop to as low as 15°C (60°F). This pleasant climate makes Charleston an ideal destination for outdoor activities and exploration during this time of year.

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 25°C (77°F), with highs reaching up to 35°C (95°F) and lows dropping to around 15°C (60°F).
JanFebMarAprMayJunJulAugSepOctNovDec343743536372787670614639
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 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.
JanFebMarAprMayJunJulAugSepOctNovDec66107103111118941441269113082102
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 65%. With an average temperature of 25°C (77°F), this humidity feels like a warm embrace, making outdoor activities slightly uncomfortable but still bearable, as the sticky air clings to your skin and encourages you to seek shade or a refreshing drink.

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 65%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%81%78%70%69%62%65%68%74%82%80%
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.
JanFebMarAprMayJunJulAugSepOctNovDec356810101098642
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 Weather1°C (35°F)66 mm (2.6 inches)84%moderate
February Weather3°C (37°F)107 mm (4.2 inches)82%moderate
March Weather6°C (43°F)103 mm (4.0 inches)81%high
April Weather12°C (53°F)111 mm (4.4 inches)78%very high
May Weather17°C (63°F)118 mm (4.6 inches)69%very high
June Weather22°C (73°F)94 mm (3.7 inches)69%very high
July Weather26°C (79°F)144 mm (5.6 inches)62%very high
August Weather25°C (77°F)126 mm (5.0 inches)65%very high
September Weather21°C (71°F)91 mm (3.6 inches)68%very high
October Weather16°C (61°F)130 mm (5.1 inches)74%high
November Weather8°C (47°F)82 mm (3.2 inches)82%moderate
December Weather4°C (39°F)102 mm (4.0 inches)80%low

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