Northern Ireland weather by month

Check out Northern Ireland weather averages by month. Compare detailed monthly climate statistics including temperature, rainfall and sunshine figures.

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum daytime temperature °F
45°F maximum daytime temperature in January in Belfast45
45°F maximum daytime temperature in February in Belfast45
48°F maximum daytime temperature in March in Belfast48
52°F maximum daytime temperature in April in Belfast52
57°F maximum daytime temperature in May in Belfast57
63°F maximum daytime temperature in June in Belfast63
64°F maximum daytime temperature in July in Belfast64
64°F maximum daytime temperature in August in Belfast64
61°F maximum daytime temperature in September in Belfast61
55°F maximum daytime temperature in October in Belfast55
48°F maximum daytime temperature in November in Belfast48
46°F maximum daytime temperature in December in Belfast46
Hours of sunshine (daily)
Days with some rainfall
20 days with some rainfall in January in Belfast20
16 days with some rainfall in February in Belfast16
19 days with some rainfall in March in Belfast19
15 days with some rainfall in April in Belfast15
16 days with some rainfall in May in Belfast16
15 days with some rainfall in June in Belfast15
15 days with some rainfall in July in Belfast15
17 days with some rainfall in August in Belfast17
17 days with some rainfall in September in Belfast17
19 days with some rainfall in October in Belfast19
19 days with some rainfall in November in Belfast19
20 days with some rainfall in December in Belfast20
Sea temperature °F
48°F sea temperature in January in Belfast48
46°F sea temperature in February in Belfast46
45°F sea temperature in March in Belfast45
46°F sea temperature in April in Belfast46
48°F sea temperature in May in Belfast48
52°F sea temperature in June in Belfast52
55°F sea temperature in July in Belfast55
55°F sea temperature in August in Belfast55
57°F sea temperature in September in Belfast57
55°F sea temperature in October in Belfast55
54°F sea temperature in November in Belfast54
50°F sea temperature in December in Belfast50

More weather >>

More about Northern Ireland

Northern Ireland by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for Northern Ireland

Fred Olsen: Top cruise offers for 2026/2027

  • Explore latest offers on Fred Olsen Cruises in 2026/2027
  • Find last minute deals or early bird discounts
  • Filter offers by price, destination, ship & departure point
Go to Fred Olsen deal >>

View all Fred Olsen offers

Fred OlsenCruise deal finder

The climate guide for Northern Ireland (Belfast) shows long term monthly weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Top Northern Ireland destinations

Below are average maximum temperatures at popular countries, regions and places in Northern Ireland for next month - February. Select a destination to see the climate guide for all months of the year.

All Northern Ireland destinations

Metric (°C)  |  Imperial (°F)

Back to top

Northern Ireland weather averages

Temperature in Northern Ireland (°F)

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Max temperature (daytime)
45°F maximum daytime temperature in January in Northern Ireland (Belfast)45
45°F maximum daytime temperature in February in Northern Ireland (Belfast)45
48°F maximum daytime temperature in March in Northern Ireland (Belfast)48
52°F maximum daytime temperature in April in Northern Ireland (Belfast)52
57°F maximum daytime temperature in May in Northern Ireland (Belfast)57
63°F maximum daytime temperature in June in Northern Ireland (Belfast)63
64°F maximum daytime temperature in July in Northern Ireland (Belfast)64
64°F maximum daytime temperature in August in Northern Ireland (Belfast)64
61°F maximum daytime temperature in September in Northern Ireland (Belfast)61
55°F maximum daytime temperature in October in Northern Ireland (Belfast)55
48°F maximum daytime temperature in November in Northern Ireland (Belfast)48
46°F maximum daytime temperature in December in Northern Ireland (Belfast)46
Min temperature (night-time)
34°F minimum night-time temperature in January in Northern Ireland (Belfast)34
34°F minimum night-time temperature in February in Northern Ireland (Belfast)34
36°F minimum night-time temperature in March in Northern Ireland (Belfast)36
39°F minimum night-time temperature in April in Northern Ireland (Belfast)39
43°F minimum night-time temperature in May in Northern Ireland (Belfast)43
48°F minimum night-time temperature in June in Northern Ireland (Belfast)48
52°F minimum night-time temperature in July in Northern Ireland (Belfast)52
52°F minimum night-time temperature in August in Northern Ireland (Belfast)52
48°F minimum night-time temperature in September in Northern Ireland (Belfast)48
45°F minimum night-time temperature in October in Northern Ireland (Belfast)45
37°F minimum night-time temperature in November in Northern Ireland (Belfast)37
36°F minimum night-time temperature in December in Northern Ireland (Belfast)36
Heat & Humidity
No heat & humidity in January in Northern Ireland (Belfast)0
No heat & humidity in February in Northern Ireland (Belfast)0
No heat & humidity in March in Northern Ireland (Belfast)0
No heat & humidity in April in Northern Ireland (Belfast)0
No heat & humidity in May in Northern Ireland (Belfast)0
No heat & humidity in June in Northern Ireland (Belfast)0
No heat & humidity in July in Northern Ireland (Belfast)0
No heat & humidity in August in Northern Ireland (Belfast)0
No heat & humidity in September in Northern Ireland (Belfast)0
No heat & humidity in October in Northern Ireland (Belfast)0
No heat & humidity in November in Northern Ireland (Belfast)0
No heat & humidity in December in Northern Ireland (Belfast)0
Sea temperature
48°F sea temperature in January in Northern Ireland (Belfast)48
46°F sea temperature in February in Northern Ireland (Belfast)46
45°F sea temperature in March in Northern Ireland (Belfast)45
46°F sea temperature in April in Northern Ireland (Belfast)46
48°F sea temperature in May in Northern Ireland (Belfast)48
52°F sea temperature in June in Northern Ireland (Belfast)52
55°F sea temperature in July in Northern Ireland (Belfast)55
55°F sea temperature in August in Northern Ireland (Belfast)55
57°F sea temperature in September in Northern Ireland (Belfast)57
55°F sea temperature in October in Northern Ireland (Belfast)55
54°F sea temperature in November in Northern Ireland (Belfast)54
50°F sea temperature in December in Northern Ireland (Belfast)50

Note: 0 = None, L = Low, M = Moderate, H = High, VH = Very high, E = Extreme

Sunshine & UV index in Northern Ireland

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Daily hours of sunshine
Daily hours of daylight
8 hours of daylight per day in January in Northern Ireland (Belfast)8
10 hours of daylight per day in February in Northern Ireland (Belfast)10
12 hours of daylight per day in March in Northern Ireland (Belfast)12
14 hours of daylight per day in April in Northern Ireland (Belfast)14
16 hours of daylight per day in May in Northern Ireland (Belfast)16
17 hours of daylight per day in June in Northern Ireland (Belfast)17
17 hours of daylight per day in July in Northern Ireland (Belfast)17
15 hours of daylight per day in August in Northern Ireland (Belfast)15
13 hours of daylight per day in September in Northern Ireland (Belfast)13
10 hours of daylight per day in October in Northern Ireland (Belfast)10
8 hours of daylight per day in November in Northern Ireland (Belfast)8
7 hours of daylight per day in December in Northern Ireland (Belfast)7
UV Index (Maximum)
No UV (maximum) index in January in Northern Ireland (Belfast)0
UV (maximum) index 1 (Low) in February in Northern Ireland (Belfast)1
UV (maximum) index 2 (Low) in March in Northern Ireland (Belfast)2
UV (maximum) index 3 (Moderate) in April in Northern Ireland (Belfast)3
UV (maximum) index 5 (Moderate) in May in Northern Ireland (Belfast)5
UV (maximum) index 6 (High) in June in Northern Ireland (Belfast)6
UV (maximum) index 6 (High) in July in Northern Ireland (Belfast)6
UV (maximum) index 5 (Moderate) in August in Northern Ireland (Belfast)5
UV (maximum) index 3 (Moderate) in September in Northern Ireland (Belfast)3
UV (maximum) index 2 (Low) in October in Northern Ireland (Belfast)2
UV (maximum) index 1 (Low) in November in Northern Ireland (Belfast)1
No UV (maximum) index in December in Northern Ireland (Belfast)0

Rainfall in Northern Ireland

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Number of days with some rain
20 days with some rainfall in January in Northern Ireland (Belfast)20
16 days with some rainfall in February in Northern Ireland (Belfast)16
19 days with some rainfall in March in Northern Ireland (Belfast)19
15 days with some rainfall in April in Northern Ireland (Belfast)15
16 days with some rainfall in May in Northern Ireland (Belfast)16
15 days with some rainfall in June in Northern Ireland (Belfast)15
15 days with some rainfall in July in Northern Ireland (Belfast)15
17 days with some rainfall in August in Northern Ireland (Belfast)17
17 days with some rainfall in September in Northern Ireland (Belfast)17
19 days with some rainfall in October in Northern Ireland (Belfast)19
19 days with some rainfall in November in Northern Ireland (Belfast)19
20 days with some rainfall in December in Northern Ireland (Belfast)20
Average monthly rainfall (inches)
4.0 inches monthly rainfall in January in Northern Ireland (Belfast)4.0
2.8 inches monthly rainfall in February in Northern Ireland (Belfast)2.8
3.1 inches monthly rainfall in March in Northern Ireland (Belfast)3.1
2.5 inches monthly rainfall in April in Northern Ireland (Belfast)2.5
2.6 inches monthly rainfall in May in Northern Ireland (Belfast)2.6
2.7 inches monthly rainfall in June in Northern Ireland (Belfast)2.7
2.5 inches monthly rainfall in July in Northern Ireland (Belfast)2.5
3.5 inches monthly rainfall in August in Northern Ireland (Belfast)3.5
3.7 inches monthly rainfall in September in Northern Ireland (Belfast)3.7
3.9 inches monthly rainfall in October in Northern Ireland (Belfast)3.9
3.8 inches monthly rainfall in November in Northern Ireland (Belfast)3.8
3.7 inches monthly rainfall in December in Northern Ireland (Belfast)3.7

Compare Northern Ireland weather with the UK

The weather chart below compares the average monthly maximum daytime temperature for Nothern Ireland (Belfast) and the UK (London).

Maximum daytime temperature (°F)

Nothern Ireland (Belfast)
UK (London)
45
45
45
45
48
50
52
55
57
63
63
68
64
72
64
72
61
66
55
59
48
50
46
46
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Metric (°C)  |  Imperial (°F)

Compare more weather >>

Back to top

More about the UK

Related posts

Popular travel offers

Explore holiday destinations

More holidays

Save with latest deals & discounts

More deals

Airport parking

More parking

Airport lounges

More lounges

Top ^