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May Weather in Swansea, United States

Last updated: June 24, 2025

In May, the average temperature in Swansea, United States is 15°C (58°F), with temperatures ranging from a cool 2°C (36°F) to a warm 33°C (91°F). Visitors should be prepared for potential rain, as precipitation amounts can reach 101 mm (4.0 in) over the course of 12 days. The average humidity during this month sits at a comfortable 75%, making it an ideal time to explore the region.

May Temperature in Swansea

In May in Swansea, the average temperature is 15°C (58°F). The maximum can reach 33°C (91°F), and the minimum can be as low as 2°C (36°F). This diverse range of temperatures makes it advisable for travelers to pack layers and be prepared for varying weather 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 15°C (58°F), with highs reaching up to 33°C (91°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec333539485868747367574536
Data source: Temperature data for Swansea 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.

May Precipitation in Swansea

In Swansea in May, the precipitation amount is 101 mm (4.0 in) spread over 12 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 101 mm (4.0 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec7492102123101971229297135101120
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Swansea

In Swansea in May humidity is 75%. With an average temperature of 15°C (58°F), this humidity feels like you're stepping into a warm, damp blanket, making travel a bit more challenging as the air clings to your skin, leaving you craving a refreshing breeze along the way.

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.
JanFebMarAprMayJunJulAugSepOctNovDec84%84%82%79%75%78%76%76%76%75%80%80%
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 is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3568910998642
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.
 TemperaturePrecipitationHumidityUV
January Weather0°C (33°F)74 mm (2.9 inches)84%moderate
February Weather1°C (35°F)92 mm (3.6 inches)84%moderate
March Weather4°C (39°F)102 mm (4.0 inches)82%high
April Weather9°C (49°F)123 mm (4.9 inches)79%very high
May Weather15°C (58°F)101 mm (4.0 inches)75%very high
June Weather20°C (68°F)97 mm (3.8 inches)78%very high
July Weather23°C (74°F)122 mm (4.8 inches)76%very high
August Weather23°C (74°F)92 mm (3.6 inches)76%very high
September Weather19°C (67°F)97 mm (3.8 inches)75%very high
October Weather14°C (57°F)135 mm (5.3 inches)75%high
November Weather7°C (45°F)101 mm (4.0 inches)80%moderate
December Weather2°C (36°F)120 mm (4.7 inches)80%low

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