May Weather in Charleston, Australia

Last updated: August 22, 2025

In May, the average temperature in Charleston, Australia hovers around 12°C (53°F). Expect a minimum of 1°C (34°F) and a maximum of 26°C (80°F). During this time, you can anticipate about 39 mm (1.5 in) of precipitation spread over 8 days, while the average humidity sits at a comfortable 73%.

May Temperature in Charleston

In May in Charleston, the average temperature is 12°C (53°F). The maximum can reach 26°C (80°F) and the minimum can be as low as 1°C (34°F). This makes it a great time for travelers to enjoy mild weather while exploring the sights.

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 12°C (53°F), with highs reaching up to 26°C (80°F) and lows dropping to around 1°C (34°F).

Data source: Temperature data for Charleston generated using information from the Copernicus Climate Change Service.

May Precipitation in Charleston

In Charleston in May, the precipitation amount is 39 mm (1.5 in) over the course of 8 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 39 mm (1.5 inches) of precipitation spread over approximately 8 days.

Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

May Humidity in Charleston

In Charleston in May humidity is 73%. With an average temperature of 12°C (53°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities somewhat uncomfortable and requiring layers to keep warm while 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 73%, offering insight into how humid the weather typically is during this month.

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 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. 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 5, which falls under the moderate exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	21°C (69°F)	17 mm (0.7 inches)	41%	extreme
February Weather	19°C (66°F)	22 mm (0.9 inches)	46%	extreme
March Weather	18°C (65°F)	11 mm (0.4 inches)	55%	extreme
April Weather	15°C (60°F)	26 mm (1.0 inches)	66%	very high
May Weather	12°C (53°F)	39 mm (1.5 inches)	73%	moderate
June Weather	9°C (49°F)	42 mm (1.7 inches)	76%	moderate
July Weather	9°C (49°F)	53 mm (2.1 inches)	76%	moderate
August Weather	9°C (49°F)	65 mm (2.6 inches)	70%	moderate
September Weather	11°C (53°F)	40 mm (1.6 inches)	65%	very high
October Weather	14°C (57°F)	38 mm (1.5 inches)	51%	very high
November Weather	17°C (62°F)	44 mm (1.7 inches)	50%	extreme
December Weather	19°C (66°F)	18 mm (0.7 inches)	46%	extreme