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August Weather in Charleston, United States

Last updated: June 24, 2025

In August, the average temperature in Charleston, United States hovers around 27°C (81°F), with a minimum of 18°C (64°F) and a maximum reaching up to 36°C (97°F). Expect 124 mm (4.9 in) of precipitation over approximately 13 days, contributing to an average humidity of 75%. Embrace the warm, humid climate!

August Temperature in Charleston

In August in Charleston, the average temperature is 27°C (81°F). Maximums can reach 36°C (97°F), while minimums can be as low as 18°C (64°F). Travelers should prepare for warm weather with the possibility of hot days and cooler evenings, making it ideal for 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 (81°F), with highs reaching up to 36°C (97°F) and lows dropping to around 18°C (64°F).
JanFebMarAprMayJunJulAugSepOctNovDec454958637279828177665249
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 total precipitation amount is 124 mm (4.9 in) over a span of 13 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 124 mm (4.9 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec12019516814911513411212410011384143
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 75%. With an average temperature of 27°C (81°F), this humidity feels like a blanket of warmth enveloping you, making outdoor activities sticky and potentially uncomfortable for traveling.

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 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%83%80%82%83%80%80%75%73%76%84%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.
JanFebMarAprMayJunJulAugSepOctNovDec47810111111109764
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 Weather7°C (45°F)120 mm (4.7 inches)84%moderate
February Weather10°C (49°F)195 mm (7.7 inches)83%high
March Weather14°C (58°F)168 mm (6.6 inches)80%very high
April Weather17°C (63°F)149 mm (5.9 inches)82%very high
May Weather22°C (73°F)115 mm (4.5 inches)83%extreme
June Weather26°C (79°F)134 mm (5.3 inches)80%extreme
July Weather28°C (82°F)112 mm (4.4 inches)80%extreme
August Weather27°C (81°F)124 mm (4.9 inches)75%very high
September Weather25°C (78°F)100 mm (3.9 inches)73%very high
October Weather19°C (67°F)113 mm (4.5 inches)76%high
November Weather11°C (53°F)84 mm (3.3 inches)84%high
December Weather10°C (50°F)143 mm (5.6 inches)88%moderate

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