Belfast weather in January

Weather in Belfast: January


	Average day temperature:	43.8°F
	Average night temperature:	39.1°F

	Sea water temperature:	47.2°F

	Number of sunny days:	4 days
	Day length:	7.4 - 8.8 hours

	Number of rainy days:	4 days
	Precipitation totals:	2.4 in.

more information

14 days
forecast

Belfast

sea water
temperature

Belfast

January
February
March
April

May
June
July
August

September
October
November
December

Show year:

2025

2024

2023

Day temperature

Night temperature

The highest day temperature during January of 2025 was 53°F. At the same time the lowest night temperature was 24°F. Daily and nightly averages during January were 42.5°F and 37.4°F.

Show year:

2025

2024

2023

The average sea water temperature in January of 2025 was 47.3°F. The highest and lowest sea temperatures during the month were 49.3°F and 45.9°F.

	Sunny days
	Partly cloudy days
	Cloudy days

10%

26%

65%

Mostly all days in January are cloudy but sunny and partly cloudy days are also possible.

jan

feb

mar

apr

may

jun

jul

aug

sep

oct

nov

dec

0.0

0.6

1.3

1.9

2.6

3.2

3.9

4.5

2.6

2.3

2.2

3.6

3.8

3.1

2.2

2.0

2.4

2.7

2.6

2.3

2.2

3.6

3.8

3.1

2.2

2.0

2.4

2.7

2.2

Precipitation total value in Belfast in January is 2.2 in. Other months of the year show relatively similar values.

jan

feb

mar

apr

may

jun

jul

aug

sep

oct

nov

dec

0.0

2.3

4.6

6.9

9.2

11.5

13.8

16.0

12.1

11.2

11.1

9.9

9.2

8.3

8.9

9.1

10.1

10.8

13.4

12.1

11.2

11.1

9.9

9.2

8.3

8.9

9.1

10.1

10.8

13.4

11.3

The average wind speed value in January is 11.3 mph It makes January one of the most windy months of the year.

jan

feb

mar

apr

may

jun

jul

aug

sep

oct

nov

dec

0.0

1.2

2.3

3.5

4.7

5.8

7.0

8.2

9.4

2.0

2.8

3.2

4.8

5.3

5.4

6.8

5.6

5.3

4.3

2.7

2.0

2.8

3.2

4.8

5.3

5.4

6.8

5.6

5.3

4.3

2.7

3.0

This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in January is: 3.0.