August weather forecast
Saint Helier, Jersey

The Elizabeth Castle found on the Tidal Island in Saint Helier Parish, Jersey
The Elizabeth Castle found on the Tidal Island in Saint Helier Parish, Jersey

Weather in August

The last month of the summer, August, is another comfortable month in Saint Helier, Jersey, with an average temperature fluctuating between 16.3°C (61.3°F) and 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 Saint Helier, the average relative humidity in August is 81%.

Rainfall

In Saint Helier, in August, during 13.8 rainfall days, 42mm (1.65") of precipitation is typically accumulated. 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

August is the month with the warmest seawater in Saint Helier, Jersey, with an average sea temperature of 17°C (62.6°F).
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 in August is 14h and 21min.
On the first day of the month, sunrise is at 05:40 and sunset at 20:48. On the last day of August, in Saint Helier, Jersey, sunrise is at 06:23 and sunset at 19:54 BST.

Sunshine

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

UV index

The months with the highest UV index in Saint Helier are June through September, with an average maximum UV index of 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The average daily UV index of 5 in August transform into the following instructions:
Take precautions - Protection against skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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.
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FAQ

What is the warmest month in Saint Helier?

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

What is the temperature in August in Saint Helier?

In Saint Helier, Jersey, 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?

The average relative humidity in August is 81%.

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

In Saint Helier, Jersey, in August, during 13.8 rainfall days, 42mm (1.65") of precipitation is typically accumulated.

When it does not snow in Saint Helier?

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

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

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

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

In Saint Helier, in August, the average water temperature is 17°C (62.6°F). For most, swimming in 17°C (62.6°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).

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

In Saint Helier, Jersey, the average day length in August is 14h and 21min.

When is the sunrise / sunset in August in Saint Helier?

On the first day of August in Saint Helier, sunrise is at 05:40 and sunset at 20:48. On the last day of the month, sunrise is at 06:23 and sunset at 19:54 BST.

How long on average sun shines in August in Saint Helier?

The average sunshine duration in August in Saint Helier is 9.3h.

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

The months with the highest UV index are June through September, with an average maximum UV index of 5.

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

The average daily maximum UV index in August in Saint Helier, Jersey, is 5. A UV Index reading of 3 to 5 represents a medium hazard to health from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover

Average temperature in August
Saint Helier, Jersey

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).

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Average pressure in August
Saint Helier, Jersey

Average pressure in August - Saint Helier, Jersey
  • Average pressure in August: 1016.5mbar

The month with the highest atmospheric pressure is September (1018mbar).
The month with the lowest atmospheric pressure is November (1011.8mbar).

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Average wind speed in August
Saint Helier, Jersey

Average wind speed in August - Saint Helier, Jersey
  • Average wind speed in August: 21km/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).

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Average humidity in August
Saint Helier, Jersey

Average humidity in August - Saint Helier, Jersey
  • Average humidity in August: 81%

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

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Average rainfall in August
Saint Helier, Jersey

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).

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Average rainfall days in August
Saint Helier, Jersey

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).
The months with the least rainy days are May and July (12.2 days).

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Average snowfall in August
Saint Helier, Jersey

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

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Average snowfall days in August
Saint Helier, Jersey

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

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Average sea temperature in August
Saint Helier, Jersey

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).

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Average daylight in August /
Average sunshine in August
Saint Helier, Jersey

Average daylight in August / Average sunshine in August - Saint Helier, Jersey
  • Average daylight in August: 14h and 21min

The month with the longest days is June (Average daylight: 16h and 10min).
The month with the shortest days is December (Average daylight: 8h and 17min).

  • Average sunshine in August: 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).

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Average sunshine days in August
Saint Helier, Jersey

Average sunshine days in August - Saint Helier, Jersey
  • Average sunshine days in August: 14.7 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).

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Average UV index in August
Saint Helier, Jersey

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

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).

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Average cloud cover in August
Saint Helier, Jersey

Average cloud cover in August - Saint Helier, Jersey
  • Average cloud cover in August: 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).

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Average visibility in August
Saint Helier, Jersey

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

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