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May Weather in Watford, United Kingdom

Last updated: August 27, 2025

In Watford, United Kingdom, the average temperature in May hovers around 13°C (55°F). You can expect a minimum chill of 1°C (34°F), with a peak reaching up to 26°C (79°F). During this month, 66 mm (2.6 in) of precipitation may fall over approximately 11 days, and the average humidity sits at a comfortable 79%.

May Temperature in Watford

In May in Watford, the average temperature is 13°C (55°F). Maximums can reach 26°C (79°F) and minimums can be as low as 1°C (34°F). Travelers should be prepared for a range of temperatures, making layered clothing a wise choice during this time.

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

The chart illustrates May temperature patterns in Watford, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Watford, May typically has an average temperature of 13°C (55°F), with highs reaching up to 26°C (79°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec404245495561656359534643
Data source: Temperature data for Watford 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 Watford

In Watford in May, the precipitation amount is 66 mm (2.6 in) spread over 11 days.

May Precipitation Trends in Watford

The chart displays monthly precipitation patterns in Watford, 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 Watford, May typically receives around 66 mm (2.6 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec565257346674677151915483
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Watford

In Watford in May humidity is 79%. With an average temperature of 13°C (55°F), this humidity feels like a damp chill that permeates clothing, making outdoor activities slightly uncomfortable and prompting travelers to seek shelter or dress in layers to stay warm while adjusting to the moist air.

May Average Humidity in Watford

This chart illustrates the average monthly humidity levels in Watford, 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 Watford is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%86%85%79%81%71%76%82%91%92%92%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Watford

In Watford in May, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Watford.

Maximum UV Index Levels in Watford for May

The chart shows the monthly maximum UV Index (UVI) for Watford 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 Watford typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578876421
Data source: Watford 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 Watford Compares to Other Months

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

This table compares monthly weather conditions in Watford, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)56 mm (2.2 inches)91%low
February Weather6°C (43°F)52 mm (2.0 inches)89%low
March Weather7°C (45°F)57 mm (2.2 inches)86%moderate
April Weather9°C (49°F)34 mm (1.3 inches)85%moderate
May Weather13°C (55°F)66 mm (2.6 inches)79%high
June Weather16°C (61°F)74 mm (2.9 inches)80%very high
July Weather18°C (65°F)67 mm (2.6 inches)71%very high
August Weather17°C (64°F)71 mm (2.8 inches)76%high
September Weather15°C (59°F)51 mm (2.0 inches)82%high
October Weather11°C (53°F)91 mm (3.6 inches)90%moderate
November Weather8°C (46°F)54 mm (2.1 inches)92%low
December Weather6°C (43°F)83 mm (3.3 inches)92%low

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