Cardiff
United Kingdom
Long-term weather forecast
Long-term weather forecast

August weather forecast and climate
Cardiff, United Kingdom

The last month of the summer, August, is another pleasant month in Cardiff, United Kingdom, with average temperature ranging between min 12.8°C (55°F) and max 21.5°C (70.7°F).

Temperature

In Cardiff, United Kingdom, the average high-temperature is relatively the same as in July - a still agreeable 21.5°C (70.7°F). The average low-temperature, in August, is 12.8°C (55°F).

Rainfall

In Cardiff, during August, the rain falls for 11 days and regularly aggregates up to 93.4mm (3.7") of precipitation. Throughout the year, in Cardiff, there are 148.8 rainfall days, and 1152.1mm (45.4") of precipitation is accumulated.

Sea temperature

August and September, with an average sea temperature of 16.6°C (61.9°F), are months with the warmest seawater in Cardiff, United Kingdom.
Note: For most, swimming in 16.6°C (61.9°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

In Cardiff, United Kingdom, the average length of the day in August is 14.5h.

Sunshine

In Cardiff, the average sunshine is 6.2h.

UV index

Months with the highest UV index in Cardiff are June through August, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from the exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 6 in August transform into the following instructions:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. 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. 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 temperature in August in Cardiff?

In Cardiff, in August, the average high-temperature is 21.5°C (70.7°F), and the average low-temperature is 12.8°C (55°F).

How much does it rain in Cardiff in August?

In Cardiff, in August, it is raining for 11 days, with typically 93.4mm (3.7") of accumulated precipitation.

What months are the sea warmest in Cardiff?

Months with the warmest seawater in Cardiff, United Kingdom, are August and September, with an average sea temperature of 16.6°C (61.9°F).

How cold is the water in August in Cardiff?

In August, the average sea temperature in Cardiff is 16.6°C (61.9°F). For swimming, a surface water temperature of 16.6°C (61.9°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 Cardiff have in August?

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

How long on average sun shines in August in Cardiff?

In August, the average sunshine is 6.2h.

What is the month with the highest UV index in Cardiff?

Months with the highest UV index in Cardiff are June through August, with an average maximum UV index of 6.

How high is the UV index in August in Cardiff?

In Cardiff, United Kingdom, the average daily maximum UV index in August is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from unprotected exposure to the UV radiation.
Average temperature in August - Cardiff, United Kingdom
  • Average high temperature in August: 21.5°C

The warmest month (with the highest average high temperature) is July (21.7°C).
The month with the lowest average high temperature is January (8.3°C).

  • Average low temperature in August: 12.8°C

The month with the highest average low temperature is July (13.1°C).
The coldest month (with the lowest average low temperature) is February (2.1°C).

Average rainfall in August - Cardiff, United Kingdom
  • Average rainfall in August: 93.4mm

The wettest month (with the highest rainfall) is October (133.5mm).
The driest month (with the lowest rainfall) is June (66.6mm).

Average rainfall days in August - Cardiff, United Kingdom
  • Average rainfall days in August: 11 days

The month with the highest number of rainy days is January (15.7 days).
The month with the lowest number of rainy days is June (10.1 days).

Average sea temperature in August - Cardiff, United Kingdom
  • Average sea temperature in August: 16.6°C

Best months for swimming (with the highest average sea temperature) are August and September (16.6°C).
The coldest month (with the lowest average sea temperature) is March (8.7°C).

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

The month with the longest days is June (Average daylight: 16.5h).
The month with shortest days is December (Average daylight: 7.9h).

  • Average sunshine in August: 6.2h

The month with most sunshine is July (Average sunshine: 6.4h).
The month with least sunshine is December (Average sunshine: 1.6h).

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

Months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 0).