May Weather in Swansea, United States

Last updated: June 24, 2025

In May, the average temperature in Swansea, United States is a comfortable 23°C (74°F). This period can see a minimum drop to 6°C (43°F) and a maximum rise to 38°C (101°F). Expect about 105 mm (4.2 in) of precipitation over 10 days, with an average humidity level of 75%. Enjoy the dynamic climate while planning your activities!

May Temperature in Swansea

In May in Swansea, the average temperature is 23°C (74°F). Maximums can reach 38°C (101°F) and minimums can be as low as 6°C (43°F). This makes it an ideal time for travelers to enjoy a variety of outdoor activities while being prepared for both warm and cooler conditions.

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

The chart illustrates May temperature patterns in Swansea, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Swansea, May typically has an average temperature of 23°C (74°F), with highs reaching up to 38°C (101°F) and lows dropping to around 6°C (43°F).

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

May Precipitation in Swansea

In Swansea in May, the precipitation amount is 105 mm (4.2 in) over a span of 10 days.

May Precipitation Trends in Swansea

The chart displays monthly precipitation patterns in Swansea, 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 Swansea, May typically receives around 105 mm (4.2 inches) of precipitation spread over approximately 10 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 Swansea

In Swansea in May, humidity is 75%. With an average temperature of 23°C (74°F), this humidity feels like a warm, heavy blanket wrapping around you, making it feel more sweltering than it actually is, which can be quite uncomfortable for traveling.

May Average Humidity in Swansea

This chart illustrates the average monthly humidity levels in Swansea, 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 Swansea is approximately 75%, 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 Swansea

In Swansea 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 Swansea.

Maximum UV Index Levels in Swansea for May

The chart shows the monthly maximum UV Index (UVI) for Swansea 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 Swansea typically reaches 11, which falls under the extreme exposure category.

Data source: Swansea 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 Swansea Compares to Other Months

Weather in Swansea varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Swansea, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Swansea, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	9°C (49°F)	83 mm (3.3 inches)	86%	moderate
February Weather	12°C (54°F)	100 mm (3.9 inches)	81%	high
March Weather	15°C (58°F)	76 mm (3.0 inches)	81%	very high
April Weather	19°C (66°F)	112 mm (4.4 inches)	79%	very high
May Weather	23°C (74°F)	105 mm (4.2 inches)	75%	extreme
June Weather	26°C (79°F)	121 mm (4.8 inches)	75%	extreme
July Weather	27°C (82°F)	154 mm (6.1 inches)	80%	extreme
August Weather	27°C (81°F)	141 mm (5.6 inches)	81%	extreme
September Weather	25°C (77°F)	98 mm (3.9 inches)	83%	very high
October Weather	20°C (69°F)	71 mm (2.8 inches)	78%	very high
November Weather	13°C (55°F)	61 mm (2.4 inches)	85%	high
December Weather	10°C (51°F)	129 mm (5.1 inches)	87%	moderate