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May Weather in Merton, United States

Last updated: June 24, 2025

In May, the average temperature in Merton, United States is a comfortable 14°C (58°F). However, temperatures can swing dramatically, with a minimum of -1°C (30°F) and a maximum reaching 34°C (93°F). During this time, expect an average precipitation amount of 126 mm (5.0 in) spread over 13 days, contributing to a relatively high humidity level of 78%.

May Temperature in Merton

In May in Merton, the average temperature is 14°C (58°F). The maximum can reach 34°C (93°F), and the minimum can be as low as -1°C (30°F). Be prepared for a wide range of temperatures if you're planning to travel during this time.

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

The chart illustrates May temperature patterns in Merton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Merton, May typically has an average temperature of 14°C (58°F), with highs reaching up to 34°C (93°F) and lows dropping to around -1°C (30°F).
JanFebMarAprMayJunJulAugSepOctNovDec222436455869747165523730
Data source: Temperature data for Merton 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 Merton

In Merton in May, the precipitation amount is 126 mm (5.0 in) over the course of 13 days.

May Precipitation Trends in Merton

The chart displays monthly precipitation patterns in Merton, 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 Merton, May typically receives around 126 mm (5.0 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec5451611071261069788981124646
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Merton

In Merton in May, humidity is 78%. With an average temperature of 14°C (58°F), this humidity feels like a damp embrace, making traveling a bit uncomfortable as the air clings to your skin, causing you to sweat more than usual while exploring.

May Average Humidity in Merton

This chart illustrates the average monthly humidity levels in Merton, 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 Merton is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%85%85%78%80%78%76%79%83%88%82%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Merton

In Merton 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 Merton.

Maximum UV Index Levels in Merton for May

The chart shows the monthly maximum UV Index (UVI) for Merton 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 Merton typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34589101097532
Data source: Merton 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 Merton Compares to Other Months

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

This table compares monthly weather conditions in Merton, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (23°F)54 mm (2.1 inches)85%moderate
February Weather-5°C (24°F)51 mm (2.0 inches)85%moderate
March Weather2°C (36°F)61 mm (2.4 inches)85%moderate
April Weather7°C (45°F)107 mm (4.2 inches)85%very high
May Weather14°C (58°F)126 mm (5.0 inches)78%very high
June Weather20°C (69°F)106 mm (4.2 inches)80%very high
July Weather23°C (74°F)97 mm (3.8 inches)78%very high
August Weather22°C (71°F)87 mm (3.4 inches)76%very high
September Weather18°C (65°F)98 mm (3.9 inches)79%high
October Weather11°C (52°F)112 mm (4.4 inches)83%moderate
November Weather3°C (37°F)46 mm (1.8 inches)88%moderate
December Weather-1°C (30°F)46 mm (1.8 inches)81%low

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