nomadseason

May Weather in Charleston, United States

Last updated: June 24, 2025

In Charleston, United States, the average temperature in May is 22°C (73°F). Visitors can expect temperature fluctuations, with a minimum of 8°C (47°F) and a maximum of 35°C (95°F). The region experiences an average precipitation of 115 mm (4.5 in) over 11 days, accompanied by a typically high humidity level of 83%.

May Temperature in Charleston

In May in Charleston, the average temperature is 22°C (73°F). Maximum temperatures can reach 35°C (95°F), while minimum temperatures can drop as low as 8°C (47°F). This makes it an ideal time to visit Charleston for travelers who enjoy mild weather with some warm and cooler options.

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

The chart illustrates May 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, May typically has an average temperature of 22°C (73°F), with highs reaching up to 35°C (95°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec454958637279828177665249
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.

May Precipitation in Charleston

In Charleston in May, the total precipitation amount is 115 mm (4.5 in) spread over 11 days.

May Precipitation Trends in Charleston

The chart displays monthly precipitation patterns in Charleston, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Charleston, May typically receives around 115 mm (4.5 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec12019516814911513411212410011384143
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

May Humidity in Charleston

In Charleston in May, humidity is 83%. With an average temperature of 22°C (73°F), this humidity feels like a warm, heavy blanket wrapping around you, making outdoor activities feel a bit more exhausting, yet the lush surroundings create a vibrant atmosphere perfect for exploring.

May Average Humidity in Charleston

This chart illustrates the average monthly humidity levels in Charleston, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Charleston is approximately 83%, 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 May generated using information from the Copernicus Climate Change Service.

May UV Index in Charleston

In Charleston in May, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Charleston.

Maximum UV Index Levels in Charleston for May

The chart shows the monthly maximum UV Index (UVI) for Charleston in May, 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 May, the maximum UV index in Charleston typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec47810111111109764
Data source: Charleston May 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 May 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 May’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 May’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

Compare Charleston's Climate with Cities Worldwide