Portsmouth
United Kingdom
Long-term weather forecast
Long-term weather forecast

August weather forecast and climate
Portsmouth, United Kingdom

The last month of the summer, August, is another pleasant month in Portsmouth, United Kingdom, with average temperature fluctuating between 21.4°C (70.5°F) and 14.3°C (57.7°F).

Temperature

July and August, with an average high-temperature of 21.4°C (70.5°F), are the warmest months.

Rainfall

In Portsmouth, United Kingdom, in August, during 6.6 rainfall days, 50mm (2") of precipitation is typically accumulated. Throughout the year, there are 103.4 rainfall days, and 699mm (27.5") of precipitation is accumulated.

Sea temperature

In Portsmouth, United Kingdom, the average water temperature is 16.8°C (62.2°F).
Note: For swimming, a surface water temperature of 16.8°C (62.2°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).

Daylight

In Portsmouth, the average length of the day in August is 14.5h.

Sunshine

In Portsmouth, the average sunshine is 7.8h.

UV index

May through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health risk from the exposure to the Sun's UV radiation for the ordinary person.
Note: The average daily UV index of 6 in August transform into the following instructions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. 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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

What is the warmest month in Portsmouth?

Warmest months are July and August, with an average high-temperature of 21.4°C (70.5°F).

What is the temperature in August in Portsmouth?

In August, the average high-temperature is 21.4°C (70.5°F), and the average low-temperature is 14.3°C (57.7°F).

How many days does it rain in August in Portsmouth?

In August, the rain falls for 6.6 days. Throughout August, 50mm (2") of precipitation is accumulated.

What is the sea water temperature in August in Portsmouth?

In Portsmouth, United Kingdom, in August, the average water temperature is 16.8°C (62.2°F). Swimming in 16.8°C (62.2°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 many hours of daylight does Portsmouth have in August?

In Portsmouth, the average length of the day in August is 14.5h.

How long on average sun shines in August in Portsmouth?

In Portsmouth, the average sunshine in August is 7.8h.

When is the highest UV index in Portsmouth?

May through August, with an average maximum UV index of 6, are months with the highest UV index in Portsmouth, United Kingdom.

What is the UV index reading in August in Portsmouth?

In Portsmouth, United Kingdom, the average daily maximum UV index in August is 6. A UV Index of 6 to 7 symbolizes a high health threat from unprotected exposure to the UV radiation.
Average temperature in August - Portsmouth, United Kingdom
  • Average high temperature in August: 21.4°C

Warmest months (with the highest average high temperature) are July and August (21.4°C).
Months with the lowest average high temperature are January and February (8.2°C).

  • Average low temperature in August: 14.3°C

The month with the highest average low temperature is August (14.3°C).
The coldest month (with the lowest average low temperature) is February (2.8°C).

Average rainfall in August - Portsmouth, United Kingdom
  • Average rainfall in August: 50mm

The wettest month (with the highest rainfall) is October (86.2mm).
The driest month (with the lowest rainfall) is June (42mm).

Average rainfall days in August - Portsmouth, United Kingdom
  • Average rainfall days in August: 6.6 days

Months with the highest number of rainy days are January and December (11.2 days).
The month with the lowest number of rainy days is July (5.4 days).

Average sea temperature in August - Portsmouth, United Kingdom
  • Average sea temperature in August: 16.8°C

The best month for swimming (with the highest average sea temperature) is September (17.3°C).
The coldest month (with the lowest average sea temperature) is March (8.6°C).

Average daylight in August / Average sunshine in August - Portsmouth, United Kingdom
  • Average daylight in August: 14.5h

The month with the longest days is June (Average daylight: 16.4h).
The month with shortest days is December (Average daylight: 8h).

  • Average sunshine in August: 7.8h

The month with most sunshine is July (Average sunshine: 8.4h).
The month with least sunshine is December (Average sunshine: 2h).

Average UV index in August - Portsmouth, United Kingdom
  • Average UV index in August: 6

Months with the highest UV index are May, June, July and August (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 1).