August 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
The last month of the summer, August, is also an enjoyable month in Saint Helier, Jersey, with average temperature ranging between min 16.3°C (61.3°F) and max 18.2°C (64.8°F).

Temperature

The warmest month is August, with an average high-temperature of 18.2°C (64.8°F) and an average low-temperature of 16.3°C (61.3°F).

Humidity

In August, the average relative humidity in Saint Helier is 81%.

Rainfall

In Saint Helier, Jersey, it is raining for 13.8 days, with typically 42mm (1.65") of accumulated precipitation. In Saint Helier, during the entire year, the rain falls for 189 days and collects up to 538mm (21.18") of precipitation.

Snowfall

In Saint Helier snow does not fall in April through October.

Sea temperature

With an average sea temperature of 17°C (62.6°F), August is the month with the warmest seawater.
Note: 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).

Daylight

In Saint Helier, the average length of the day is 14.3h.

Sunshine

In Saint Helier, the average sunshine is 9.3h.

UV index

June through September, with an average maximum UV index of 5, are months with the highest UV index. A UV Index value of 3 to 5 symbolizes a medium vulnerability from the exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 5 interpret into the following advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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 warmest month in Saint Helier?

With an average high-temperature of 18.2°C (64.8°F) and an average low-temperature of 16.3°C (61.3°F), August is the warmest month in Saint Helier.

What is the temperature in August in Saint Helier?

In August, the average high-temperature is 18.2°C (64.8°F), and the average low-temperature is 16.3°C (61.3°F).

What is the average humidity in August in Saint Helier?

In August, the average relative humidity in Saint Helier, Jersey, is 81%.

How much does it rain in Saint Helier in August?

In Saint Helier, Jersey, in August, it is raining for 13.8 days, with typically 42mm (1.65") of accumulated precipitation.

When it does not snow in Saint Helier?

In Saint Helier, Jersey, snow does not fall in April through October.

When is the sea warmest in Saint Helier?

With an average sea temperature of 17°C (62.6°F), August is the month with the warmest seawater.

How cold is the water in August in Saint Helier?

In Saint Helier, in August, the average water temperature is 17°C (62.6°F). For swimming, a surface water temperature of 17°C (62.6°F) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 21°C (69.8°F).

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

The average length of the day in August is 14.3h.

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

In Saint Helier, Jersey, the average sunshine in August is 9.3h.

What are the months with the highest UV index in Saint Helier?

Months with the highest UV index in Saint Helier are June through September, with an average maximum UV index of 5.

What is the UV index reading in August in Saint Helier?

The average daily maximum UV index in August in Saint Helier, Jersey, is 5. A UV Index value of 3 to 5 symbolizes a medium health risk from unprotected exposure to the UV radiation.
Average temperature in August - Saint Helier, Jersey
  • Average high temperature in August: 18.2°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 August: 16.3°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 humidity in August - Saint Helier, Jersey
  • Average humidity in August: 81%

Months with the highest relative humidity are June and July (83%).
Months with the lowest relative humidity are November and December (78%).

Average rainfall in August - Saint Helier, Jersey
  • Average rainfall in August: 42mm

The wettest month (with the highest rainfall) is November (78mm).
The driest month (with the least rainfall) is July (25mm).

Average rainfall days in August - Saint Helier, Jersey
  • Average rainfall days in August: 13.8 days

The month with the highest number of rainy days is November (21.2 days).
Months with the least rainy days are May and July (12.2 days).

Average snowfall in August - Saint Helier, Jersey
  • Average snowfall in August: 0mm

The month with the highest snowfall is January (2mm).
Months with the least snowfall are April, May, June, July, August, September and October (0mm).

Average snowfall days in August - Saint Helier, Jersey
  • Average snowfall days in August: 0 days

Months with the highest number of snowfall days are January and February (0.4 days).
Months with the least snowfall days are April, May, June, July, August, September and October (0 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).
The 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 the shortest days is December (Average daylight: 8.3h).

  • Average sunshine in August: 9.3h

The month with the most sunshine is July (Average sunshine: 9.7h).
Months with the least sunshine are January and November (Average sunshine: 4).

Average UV index in August - Saint Helier, Jersey
  • Average UV index in August: 5

Months with the highest UV index are June, July, August and September (UV index 5).
Months with the lowest UV index are January and February (UV index 2).