May weather forecastSaint Helier, Jersey
May
Weather in May
May marks the definitive end of cold weather in Saint Helier. The spring weather starts transitioning into summer, brewing a mild and enjoyable climate. A significant decrease in the rainfall amount is observed, decreasing from 32mm (1.26") in April to 26mm (1.02") in May. The increasing sunlight hours promise more playful afternoons and extended evenings. This month only further strengthens Saint Helier's picturesque image, with colourful blooms set against clear skies.Temperature
As Saint Helier welcomes May, the average high-temperature is noted at a moderate 13.3°C (55.9°F), closely aligning with the preceding month. May nights experience a minor temperature downturn to a fresh 11°C (51.8°F).Humidity
The average relative humidity in May in Saint Helier is 82%.Rainfall
In Saint Helier, in May, during 12.2 rainfall days, 26mm (1.02") of precipitation is typically accumulated. In Saint Helier, Jersey, during the entire year, the rain falls for 189 days and collects up to 538mm (21.18") of precipitation.Snowfall
April through October are months without snowfall in Saint Helier.Sea temperature
In May, the average sea temperature in Saint Helier is 11°C (51.8°F).Note: Swimming in 11°C (51.8°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation.
Daylight
In May, the average length of the day is 15h and 20min.On the first day of May, sunrise is at 05:45 and sunset at 20:25. On the last day of the month, sunrise is at 05:08 and sunset at 21:04 BST.
Sunshine
In Saint Helier, the average sunshine in May is 9.3h.UV index
In Saint Helier, Jersey, the average daily maximum UV index in May is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the average person.Note: An average UV index of 4 in May transforms into this advice:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Saint Helier, Jersey
- Average high temperature in May: 13.3°C
The warmest month (with the highest average high temperature) is August (18.2°C).
The month with the lowest average high temperature is February (9°C).
- Average low temperature in May: 11°C
The month with the highest average low temperature is August (16.3°C).
The coldest month (with the lowest average low temperature) is February (6.8°C).
Average pressure in May
Saint Helier, Jersey
- Average pressure in May: 1017.3mbar
The month with the highest atmospheric pressure is September (1018mbar).
The month with the lowest atmospheric pressure is November (1011.8mbar).
Average wind speed in May
Saint Helier, Jersey
- Average wind speed in May: 22km/h
The windiest month (with the highest average wind speed) is December (34km/h).
The calmest month (with the lowest average wind speed) is July (20.4km/h).
Average humidity in May
Saint Helier, Jersey
- Average humidity in May: 82%
The months with the highest relative humidity are June and July (83%).
The months with the lowest relative humidity are November and December (78%).
Average rainfall in May
Saint Helier, Jersey
- Average rainfall in May: 26mm
The wettest month (with the highest rainfall) is November (78mm).
The driest month (with the least rainfall) is July (25mm).
Average rainfall days in May
Saint Helier, Jersey
- Average rainfall days in May: 12.2 days
The month with the highest number of rainy days is November (21.2 days).
The months with the least rainy days are May and July (12.2 days).
Average snowfall in May
Saint Helier, Jersey
- Average snowfall in May: 0mm
The month with the highest snowfall is January (2mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in May
Saint Helier, Jersey
- Average snowfall days in May: 0 days
The months with the highest number of snowfall days are January and February (0.4 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average sea temperature in May
Saint Helier, Jersey
- Average sea temperature in May: 11°C
The best month for swimming (with the highest average sea temperature) is August (17°C).
The coldest months (with the lowest average sea temperature) are February and March (9°C).
Average daylight in May /
Average sunshine in May
Saint Helier, Jersey
- Average daylight in May: 15h and 18min
The month with the longest days is June (Average daylight: 16h and 12min).
The month with the shortest days is December (Average daylight: 8h and 18min).
- Average sunshine in May: 9h and 18min
The month with the most sunshine is July (Average sunshine: 9h and 42min).
The months with the least sunshine are January and November (Average sunshine: 4h and 0min).
Average sunshine days in May
Saint Helier, Jersey
- Average sunshine days in May: 16.8 days
The month with the most sunshine days is May (16.8 days).
The month with the least sunshine days is November (5.8 days).
Average UV index in May
Saint Helier, Jersey
- Average UV index in May: 4
The months with the highest UV index are June, July, August and September (UV index 5).
The months with the lowest UV index are January and February (UV index 2).
Average cloud cover in May
Saint Helier, Jersey
- Average cloud cover in May: 39
The months with the most cloud cover are January, November and December (Cloud cover 61).
The month with the least cloud cover is July (Cloud cover 37).
Average visibility in May
Saint Helier, Jersey
- Average visibility in May: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
