July 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
July is a pleasant summer month in Saint Helier, Jersey, with temperature in the range of an average high of 21.1°C (70°F) and an average low of 14°C (57.2°F).

Temperature

In Saint Helier, the average high-temperature is 21.1°C (70°F), and the average low-temperature is 14°C (57.2°F).

Rainfall

The month with the least rainfall in Saint Helier is July when the rain falls for 9.9 days and typically collects 37mm (1.5") of precipitation.

Sea temperature

In July, the average sea temperature is 16°C (60.8°F). For most, swimming in 16°C (60.8°F) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 21°C (69.8°F) to 15°C (59°F).

Daylight

The average length of the day is 15.7h.

Sunshine

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

UV index

June and July, with an average UV index of 7, are months with the highest UV index.

What is the temperature in July in Saint Helier?

In July, in Saint Helier, Jersey, the average high-temperature is 21.1°C (70°F), and the average low-temperature is 14°C (57.2°F).

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

In Saint Helier, in July, it is raining for 9.9 days, with typically 37mm (1.5") of accumulated precipitation.

What is the driest month in Saint Helier?

The month with the least rainfall in Saint Helier is July when the rain falls for 9.9 days and typically collects 37mm (1.5") of precipitation.

How cold is the water in July in Saint Helier?

In Saint Helier, Jersey, the average seawater temperature in July is 16°C (60.8°F). Swimming in 16°C (60.8°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F).

What is the average length of the day in July in Saint Helier?

In July, the average length of the day in Saint Helier, Jersey, is 15.7h.

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 long on average sun shines in July in Saint Helier?

The average sunshine in July in Saint Helier, Jersey, is 8h.

What is the month with the highest UV index in Saint Helier?

June and July, with an average UV index of 7, are months with the highest UV index in Saint Helier.

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

The average UV index in July is 7.
Average temperature in July - Saint Helier, Jersey
  • Average high temperature in July: 21.1°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 July: 14°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 July - Saint Helier, Jersey
  • Average rainfall in July: 37mm

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 July - Saint Helier, Jersey
  • Average rainfall days in July: 9.9 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 July - Saint Helier, Jersey
  • Average sea temperature in July: 16°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 July / Average sunshine in July - Saint Helier, Jersey
  • Average daylight in July: 15.7h

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 July: 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 July - Saint Helier, Jersey
  • Average UV index in July: 7

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).

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