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June Weather in Charleston, United States

Last updated: June 24, 2025

In June, the average temperature in Charleston, United States hovers around 26°C (78°F). Expect a range from a cool 12°C (55°F) to a warm 37°C (98°F), making it a month of contrasts. Precipitation totals about 109 mm (4.3 in) over 9 days, contributing to an average humidity of 81%, creating a lush and vibrant atmosphere.

June Temperature in Charleston

In June, in Charleston, the average temperature is 26°C (78°F), with maximums reaching 37°C (98°F) and minimums dropping as low as 12°C (55°F). Pack accordingly to enjoy warm days and cooler evenings during your travels.

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

The chart illustrates June 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, June typically has an average temperature of 26°C (78°F), with highs reaching up to 37°C (98°F) and lows dropping to around 12°C (55°F).
JanFebMarAprMayJunJulAugSepOctNovDec414555607078828076635146
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.

June Precipitation in Charleston

In Charleston in June, the total precipitation amount is 109 mm (4.3 in) spread over 9 days.

June Precipitation Trends in Charleston

The chart displays monthly precipitation patterns in Charleston, with values for each month alongside June’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how June’s conditions compare to those of other months. In Charleston, June typically receives around 109 mm (4.3 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec8011613116119710987125591137690
Data source: Precipitation data for June generated using information from the Copernicus Climate Change Service.
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June Humidity in Charleston

In Charleston in June, humidity is 81%. With an average temperature of 26°C (78°F), this humidity feels like a thick, warm blanket enveloping you, making outdoor activities feel a bit more strenuous and the air heavy, which can be quite challenging for traveling.

June Average Humidity in Charleston

This chart illustrates the average monthly humidity levels in Charleston, with June’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In June, average humidity in Charleston is approximately 81%, 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 June generated using information from the Copernicus Climate Change Service.

June UV Index in Charleston

In Charleston in June, 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 June

The chart shows the monthly maximum UV Index (UVI) for Charleston in June, 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 June, the maximum UV index in Charleston typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810111111109754
Data source: Charleston June 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 June 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 June’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 June’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

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