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May Weather in Harmondsworth, United Kingdom

Last updated: August 27, 2025

In May, the average temperature in Harmondsworth, United Kingdom hovers around 13°C (55°F), with a minimum dipping to 1°C (35°F) and a maximum reaching 26°C (78°F). Expect about 63 mm (2.5 in) of precipitation over approximately 10 days, accompanied by an average humidity of 79%. Stay prepared for variable weather as you enjoy your time in this charming destination!

May Temperature in Harmondsworth

In May in Harmondsworth, the average temperature is 13°C (55°F), with maximums reaching up to 26°C (78°F) and minimums dropping as low as 1°C (35°F). This makes it an ideal time for travelers to enjoy a mix of warm days and cool evenings, perfect for exploring the local attractions.

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

The chart illustrates May temperature patterns in Harmondsworth, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Harmondsworth, May typically has an average temperature of 13°C (55°F), with highs reaching up to 26°C (78°F) and lows dropping to around 1°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec414345495562656459534643
Data source: Temperature data for Harmondsworth 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 Harmondsworth

In Harmondsworth in May, the precipitation amount is 63 mm (2.5 in) over a span of 10 days.

May Precipitation Trends in Harmondsworth

The chart displays monthly precipitation patterns in Harmondsworth, 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 Harmondsworth, May typically receives around 63 mm (2.5 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec525255336374646745865382
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Harmondsworth

In Harmondsworth 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 Harmondsworth

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

In Harmondsworth 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 Harmondsworth.

Maximum UV Index Levels in Harmondsworth for May

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

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

This table compares monthly weather conditions in Harmondsworth, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)52 mm (2.1 inches)91%low
February Weather6°C (43°F)52 mm (2.0 inches)89%low
March Weather7°C (46°F)55 mm (2.2 inches)86%moderate
April Weather10°C (49°F)33 mm (1.3 inches)85%moderate
May Weather13°C (55°F)63 mm (2.5 inches)79%high
June Weather16°C (62°F)74 mm (2.9 inches)80%very high
July Weather18°C (65°F)64 mm (2.5 inches)71%very high
August Weather18°C (64°F)67 mm (2.6 inches)76%high
September Weather15°C (59°F)45 mm (1.8 inches)82%high
October Weather12°C (53°F)86 mm (3.4 inches)90%moderate
November Weather8°C (47°F)53 mm (2.1 inches)92%low
December Weather6°C (44°F)82 mm (3.2 inches)92%low

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