Saint Helier
Jersey
Long-term weather forecast
Long-term weather forecast

May weather forecast and climate
Saint Helier, Jersey

A shot of the Elizabeth Castle found on Tidal Island in Saint Helier Parish, Jersey
A shot of the Elizabeth Castle found on Tidal Island in Saint Helier Parish, Jersey
May, the last month of the spring, in Saint Helier, is a comfortable month, with temperature in the range of an average low of 9.4°C (48.9°F) and an average high of 16.6°C (61.9°F).

Temperature

In Saint Helier, the average high-temperature slightly increases, from a moderate 13.2°C (55.8°F) in April, to an enjoyable 16.6°C (61.9°F). In Saint Helier, the average low-temperature is 9.4°C (48.9°F).

Rainfall

In Saint Helier, it is raining for 12.2 days, with typically 52mm (2") of accumulated precipitation. Throughout the year, in Saint Helier, there are 176.4 rainfall days, and 853.3mm (33.6") of precipitation is accumulated.

Sea temperature

In May, the average sea temperature is 11°C (51.8°F). Swimming in 11°C (51.8°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

The average length of the day in Saint Helier is 15.3h.

Sunshine

May through August, with an average of 8h of sunshine, are months with the most sunshine in Saint Helier.

UV index

In Saint Helier, the average daily maximum UV index in May is 6. A UV Index of 6 to 7 symbolizes a high health hazard from unsafe exposure to the UV radiation for ordinary individuals.
The daily maximum UV index of 6 interpret into the following advice:
Take precautions against overexposure. Protection against sun damage is needed. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

What is the temperature in May in Saint Helier?

The average high-temperature, in May, in Saint Helier, is 16.6°C (61.9°F), while the average low-temperature is 9.4°C (48.9°F).

How many days does it rain in May in Saint Helier?

In Saint Helier, in May, it is raining for 12.2 days, with typically 52mm (2") of accumulated precipitation.

What is the sea water temperature in May in Saint Helier?

In Saint Helier, in May, the average water temperature is 11°C (51.8°F). Swimming in 11°C (51.8°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique.

How many hours of daylight does Saint Helier have in May?

In May, the average length of the day in Saint Helier is 15.3h.

What are the months with the most sunshine in Saint Helier?

Months with the most sunshine in Saint Helier are May through August, with an average of 8h of sunshine.

How many hours of sunshine does Saint Helier have in May?

The average sunshine in May in Saint Helier is 8h.

How high is the UV index in May in Saint Helier?

In Saint Helier, the average daily maximum UV index in May is 6. A UV Index estimate of 6 to 7 represents a high health risk from the exposure to the Sun's UV rays.
Average temperature in May - Saint Helier, Jersey
  • Average high temperature in May: 16.6°C

The warmest month (with the highest average high temperature) is August (21.2°C).
The month with the lowest average high temperature is January (9.5°C).

  • Average low temperature in May: 9.4°C

The month with the highest average low temperature is August (14.4°C).
The coldest month (with the lowest average low temperature) is February (4°C).

Average rainfall in May - Saint Helier, Jersey
  • Average rainfall in May: 52mm

The wettest month (with the highest rainfall) is December (110.5mm).
The driest month (with the lowest rainfall) is July (37mm).

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 December (19.5 days).
The month with the lowest number of rainy days is July (9.9 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).
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: 15.3h

The month with the longest days is June (Average daylight: 16.2h).
The month with shortest days is December (Average daylight: 8.3h).

  • Average sunshine in May: 8h

Months with most sunshine are May, June, July and August (Average sunshine: 8h).
Months with least sunshine are January and December (Average sunshine: 2).

Average UV index in May - Saint Helier, Jersey
  • Average UV index in May: 6

Months with the highest UV index are June and July (UV index 7).
Months with the lowest UV index are January, November and December (UV index 1).