August weather forecast and climate
Saint Helier, Jersey

A shot of the Elizabeth Castle found on the Tidal Island in Saint Helier Parish, Jersey
A shot of the Elizabeth Castle found on the Tidal Island in Saint Helier Parish, Jersey

What is the warmest month in Saint Helier?

With an average high-temperature of 21.2°C (70.2°F) and an average low-temperature of 14.4°C (57.9°F), August is the warmest month in Saint Helier.

What is the temperature in August in Saint Helier?

The average high-temperature, in August, in Saint Helier, is 21.2°C (70.2°F), while the average low-temperature is 14.4°C (57.9°F).

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

In Saint Helier, in August, it is raining for 10.1 days, with typically 45.6mm (1.8") of accumulated precipitation.

What is the month with the warmest sea water in Saint Helier?

Month with the warmest seawater in Saint Helier is August, with an average sea temperature of 17°C (62.6°F). Swimming in 17°C (62.6°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F).

How cold is the water in August in Saint Helier?

In August, the average sea temperature is 17°C (62.6°F). Swimming in 17°C (62.6°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F).
Average temperature in August - Saint Helier, Jersey
  • Average high temperature in August: 21.2°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 August: 14.4°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 August - Saint Helier, Jersey
  • Average rainfall in August: 45.6mm

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 August - Saint Helier, Jersey
  • Average rainfall days in August: 10.1 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 August - Saint Helier, Jersey
  • Average sea temperature in August: 17°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 August / Average sunshine in August - Saint Helier, Jersey
  • Average daylight in August: 14.3h

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 August: 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 August - Saint Helier, Jersey
  • Average UV index in August: 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).

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