nomadseason

May Weather in Johnston, United Kingdom

Last updated: August 27, 2025

In May, the average temperature in Johnston, United Kingdom hovers around 12°C (53°F), with minimums dipping to 4°C (40°F) and maximums peaking at 21°C (71°F). Expect some rain, as the region receives about 61 mm (2.4 in) of precipitation over 9 days. The atmosphere tends to be quite humid, with average humidity levels reaching 85%.

May Temperature in Johnston

In May in Johnston, the average temperature is 12°C (53°F). The maximum can reach 21°C (71°F), while the minimum can drop to as low as 4°C (40°F). This makes it an ideal time for travelers to enjoy mild weather and explore the local attractions comfortably.

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

The chart illustrates May temperature patterns in Johnston, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Johnston, May typically has an average temperature of 12°C (53°F), with highs reaching up to 21°C (71°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec454546495358616159555048
Data source: Temperature data for Johnston 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 Johnston

In Johnston in May, the precipitation amount is 61 mm (2.4 in) spread over 9 days.

May Precipitation Trends in Johnston

The chart displays monthly precipitation patterns in Johnston, 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 Johnston, May typically receives around 61 mm (2.4 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec80102935061826710197130131150
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

May Humidity in Johnston

In Johnston in May, humidity is 85%. With an average temperature of 12°C (53°F), this humidity feels like a damp embrace, making travel somewhat uncomfortable as you navigate the thick, moist air that clings to your skin.

May Average Humidity in Johnston

This chart illustrates the average monthly humidity levels in Johnston, 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 Johnston is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%84%83%84%85%86%87%86%85%85%82%80%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Johnston

In Johnston 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 Johnston.

Maximum UV Index Levels in Johnston for May

The chart shows the monthly maximum UV Index (UVI) for Johnston 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 Johnston typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124678876421
Data source: Johnston 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 Johnston Compares to Other Months

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

This table compares monthly weather conditions in Johnston, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (46°F)80 mm (3.2 inches)81%low
February Weather7°C (46°F)102 mm (4.0 inches)84%low
March Weather8°C (46°F)93 mm (3.7 inches)83%moderate
April Weather9°C (49°F)50 mm (2.0 inches)84%high
May Weather12°C (53°F)61 mm (2.4 inches)85%high
June Weather14°C (58°F)82 mm (3.2 inches)86%very high
July Weather16°C (61°F)67 mm (2.6 inches)87%very high
August Weather16°C (61°F)101 mm (4.0 inches)86%high
September Weather15°C (59°F)97 mm (3.8 inches)85%high
October Weather13°C (55°F)130 mm (5.1 inches)85%moderate
November Weather10°C (50°F)131 mm (5.2 inches)82%low
December Weather9°C (48°F)150 mm (5.9 inches)80%low

Compare Johnston's Climate with Cities Worldwide