nomadseason

May Weather in Wales, United States

Last updated: June 24, 2025

The average temperature in Wales, United States during May is a comfortable 15°C (59°F). However, temperatures can vary significantly, with minimums dipping to 1°C (33°F) and maximums soaring to 34°C (93°F). Visitors should also prepare for some rain, as precipitation reaches 107 mm (4.2 in) over approximately 12 days. With an average humidity level of 75%, it’s a great time to experience the local culture while staying prepared for fluctuating weather!

May Temperature in Wales

In May in Wales, the average temperature is 15°C (59°F). The maximum can reach 34°C (93°F), and the minimum can be as low as 1°C (33°F). Be prepared for a wide range of temperatures if you plan to travel during this month.

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

The chart illustrates May temperature patterns in Wales, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Wales, May typically has an average temperature of 15°C (59°F), with highs reaching up to 34°C (93°F) and lows dropping to around 1°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec293237485968747366554133
Data source: Temperature data for Wales 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 Wales

In Wales in May, the precipitation amount is 107 mm (4.2 in) spread over 12 days.

May Precipitation Trends in Wales

The chart displays monthly precipitation patterns in Wales, 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 Wales, May typically receives around 107 mm (4.2 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec69888712510785149959713896124
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

May Humidity in Wales

In Wales in May, humidity is 75%. With an average temperature of 15°C (59°F), this humidity feels like a warm blanket enveloping you, making it feel more oppressive than refreshing, which can be a challenge for travelers seeking comfort while exploring the area.

May Average Humidity in Wales

This chart illustrates the average monthly humidity levels in Wales, 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 Wales 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 Wales

In Wales 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 Wales.

Maximum UV Index Levels in Wales for May

The chart shows the monthly maximum UV Index (UVI) for Wales 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 Wales typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3568910998642
Data source: Wales 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 Wales Compares to Other Months

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

This table compares monthly weather conditions in Wales, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)69 mm (2.7 inches)84%moderate
February Weather0°C (32°F)88 mm (3.5 inches)84%moderate
March Weather3°C (38°F)87 mm (3.4 inches)82%high
April Weather9°C (48°F)125 mm (4.9 inches)79%very high
May Weather15°C (59°F)107 mm (4.2 inches)75%very high
June Weather20°C (69°F)85 mm (3.3 inches)78%very high
July Weather23°C (74°F)149 mm (5.9 inches)76%very high
August Weather23°C (73°F)95 mm (3.7 inches)76%very high
September Weather19°C (66°F)97 mm (3.8 inches)75%very high
October Weather13°C (55°F)138 mm (5.4 inches)75%high
November Weather5°C (42°F)96 mm (3.8 inches)80%moderate
December Weather1°C (33°F)124 mm (4.9 inches)80%low

Compare Wales's Climate with Cities Worldwide