Belfast
United Kingdom
Long-term weather forecast
Long-term weather forecast

August weather forecast and climate
Belfast, United Kingdom

A close-up view of the Northern Ireland City Hall located in Belfast, United Kingdom
A close-up view of the Northern Ireland City Hall located in Belfast, United Kingdom
The last month of the summer, August, is also an enjoyable month in Belfast, United Kingdom, with average temperature varying between 11.4°C (52.5°F) and 18.3°C (64.9°F).

Temperature

In Belfast, United Kingdom, the average high-temperature is relatively the same as in July - a still enjoyable 18.3°C (64.9°F). In August, in Belfast, the average low-temperature is 11.4°C (52.5°F).

Rainfall

In Belfast, during 13.9 rainfall days, 83.8mm (3.3") of precipitation is typically accumulated. Throughout the year, in Belfast, United Kingdom, there are 157.5 rainfall days, and 860.2mm (33.9") of precipitation is accumulated.

Sea temperature

In Belfast, the average seawater temperature is 14.2°C (57.6°F).
Note: At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 13°C (55.4°F) is not comfortable.

Daylight

The average length of the day in August is 14.9h.

Sunshine

The average sunshine in August is 4.6h.

UV index

The average daily maximum UV index in Belfast is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from the exposure to the Sun's UV radiation for average individuals.
Note: The average daily UV index of 5 transform into the following instructions:
Take precautions - Protection against sun damage is advised. 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.

What is the temperature in August in Belfast?

In August, in Belfast, United Kingdom, the average high-temperature is 18.3°C (64.9°F), and the average low-temperature is 11.4°C (52.5°F).

How much does it rain in Belfast in August?

In Belfast, United Kingdom, during August, the rain falls for 13.9 days and regularly aggregates up to 83.8mm (3.3") of precipitation.

What is the water temperature in August in Belfast?

In Belfast, United Kingdom, the average seawater temperature in August is 14.2°C (57.6°F). Swimming in 14.2°C (57.6°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique.

How many hours of daylight does Belfast have in August?

In Belfast, United Kingdom, the average length of the day in August is 14.9h.

How long on average sun shines in August in Belfast?

In Belfast, United Kingdom, the average sunshine in August is 4.6h.

What is the UV index intensity in August in Belfast?

The average daily maximum UV index in August is 5. A UV Index estimate of 3 to 5 represents a medium hazard to health from unsafe exposure to the Sun's UV rays.
Average temperature in August - Belfast, United Kingdom
  • Average high temperature in August: 18.3°C

The warmest month (with the highest average high temperature) is July (18.8°C).
The month with the lowest average high temperature is January (7.1°C).

  • Average low temperature in August: 11.4°C

The month with the highest average low temperature is July (11.7°C).
The coldest month (with the lowest average low temperature) is February (1.6°C).

Average rainfall in August - Belfast, United Kingdom
  • Average rainfall in August: 83.8mm

The wettest month (with the highest rainfall) is October (89.6mm).
The driest month (with the lowest rainfall) is May (57.3mm).

Average rainfall days in August - Belfast, United Kingdom
  • Average rainfall days in August: 13.9 days

The month with the highest number of rainy days is January (14.8 days).
The month with the lowest number of rainy days is June (11.3 days).

Average sea temperature in August - Belfast, United Kingdom
  • Average sea temperature in August: 14.2°C

The best month for swimming (with the highest average sea temperature) is September (14.3°C).
The coldest month (with the lowest average sea temperature) is March (8°C).

Average daylight in August / Average sunshine in August - Belfast, United Kingdom
  • Average daylight in August: 14.9h

The month with the longest days is June (Average daylight: 17.2h).
The month with shortest days is December (Average daylight: 7.4h).

  • Average sunshine in August: 4.6h

The month with most sunshine is May (Average sunshine: 6.4h).
The month with least sunshine is December (Average sunshine: 1.5h).

Average UV index in August - Belfast, United Kingdom
  • Average UV index in August: 5

Months with the highest UV index are June and July (UV index 6).
Months with the lowest UV index are January and December (UV index 0).