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May Weather in Harpenden, United Kingdom

Last updated: August 27, 2025

In May, the average temperature in Harpenden, United Kingdom hovers around 13°C (55°F). Daily temperatures can range from a chilly 2°C (35°F) to a pleasant 26°C (79°F). Expect about 65 mm (2.5 in) of precipitation spread over 11 days, with an average humidity of 79%, making it a characteristic time of year in this region.

May Temperature in Harpenden

In May in Harpenden, the average temperature is 13°C (55°F). The maximum can reach 26°C (79°F) and the minimum can be as low as 2°C (35°F). Pack layers to enjoy a mix of warm and cool moments during your travels.

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

The chart illustrates May temperature patterns in Harpenden, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Harpenden, 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 2°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec404345495561656459534643
Data source: Temperature data for Harpenden 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 Harpenden

In Harpenden in May, the precipitation amount is 65 mm (2.5 in) over a span of 11 days.

May Precipitation Trends in Harpenden

The chart displays monthly precipitation patterns in Harpenden, 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 Harpenden, May typically receives around 65 mm (2.5 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec545156326574677249865183
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Harpenden

In Harpenden 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 Harpenden

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

In Harpenden 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 Harpenden.

Maximum UV Index Levels in Harpenden for May

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

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

This table compares monthly weather conditions in Harpenden, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)54 mm (2.1 inches)91%low
February Weather6°C (43°F)51 mm (2.0 inches)89%low
March Weather7°C (45°F)56 mm (2.2 inches)86%moderate
April Weather9°C (49°F)32 mm (1.3 inches)85%moderate
May Weather13°C (55°F)65 mm (2.5 inches)79%high
June Weather16°C (62°F)74 mm (2.9 inches)80%very high
July Weather18°C (65°F)67 mm (2.6 inches)71%very high
August Weather18°C (64°F)72 mm (2.8 inches)76%high
September Weather15°C (59°F)49 mm (1.9 inches)82%high
October Weather12°C (53°F)86 mm (3.4 inches)90%moderate
November Weather8°C (46°F)51 mm (2.0 inches)92%low
December Weather6°C (43°F)83 mm (3.3 inches)92%low

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