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

January 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
January, like December, is a frosty winter month in Belfast, United Kingdom, with temperature in the range of an average high of 7.1°C (44.8°F) and an average low of 1.7°C (35.1°F).

Temperature

With an average high-temperature of 7.1°C (44.8°F) and an average low-temperature of 1.7°C (35.1°F), January is the coldest month.

Rainfall

In January, the rain falls for 14.8 days. Throughout January, 80.3mm (3.2") of precipitation is accumulated. Throughout the year, there are 157.5 rainfall days, and 860.2mm (33.9") of precipitation is accumulated.

Sea temperature

In Belfast, the average seawater temperature is 8.8°C (47.8°F).
Note: Swimming in 8.8°C (47.8°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.

Daylight

The average length of the day in Belfast is 8h.

Sunshine

The average sunshine in January is 1.6h.

UV index

Months with the lowest UV index in Belfast are January and December, with an average maximum UV index of 0. A UV Index estimate of 2, and below, represents a low threat to health from the exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 0 transform into the following instructions:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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 coldest month in Belfast?

The coldest month in Belfast is January, with an average high-temperature of 7.1°C (44.8°F) and an average low-temperature of 1.7°C (35.1°F).

What is the temperature in January in Belfast?

In January, in Belfast, the average high-temperature is 7.1°C (44.8°F), and the average low-temperature is 1.7°C (35.1°F).

How much does it rain in Belfast in January?

In Belfast, in January, it is raining for 14.8 days, with typically 80.3mm (3.2") of accumulated precipitation.

How cold is the water in January in Belfast?

In Belfast, in January, the average water temperature is 8.8°C (47.8°F). 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.

What is the average length of the day in January in Belfast?

The average length of the day in January in Belfast, United Kingdom, is 8h.

How many hours of sunshine does Belfast have in January?

In Belfast, United Kingdom, the average sunshine in January is 1.6h.

When is the lowest UV index in Belfast?

Months with the lowest UV index are January and December, with an average maximum UV index of 0.

What is the UV index reading in January in Belfast?

The average daily maximum UV index in January in Belfast, United Kingdom, is 0. A UV Index of 2, and less, symbolizes a low health risk from the exposure to the Sun's UV rays.
Average temperature in January - Belfast, United Kingdom
  • Average high temperature in January: 7.1°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 January: 1.7°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 January - Belfast, United Kingdom
  • Average rainfall in January: 80.3mm

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 January - Belfast, United Kingdom
  • Average rainfall days in January: 14.8 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 January - Belfast, United Kingdom
  • Average sea temperature in January: 8.8°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 January / Average sunshine in January - Belfast, United Kingdom
  • Average daylight in January: 8h

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 January: 1.6h

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 January - Belfast, United Kingdom
  • Average UV index in January: 0

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).