Belfast, United Kingdom Climate & Monthly Averages
The climate of Belfast
Belfast averages 50°F (10°C) across the year, with 7.2 hours of sunshine a day and 39.7 inches (1008 mm) of precipitation. The spread runs from January, at 45°F (7°C), to July, at 65°F (18°C).
Climate quick facts
- Hottest month: July - highs near 65°F (18°C)
- Coldest month: January - highs near 45°F (7°C)
- Decade extremes (2015-2024): 81°F (27°C) high · 24°F (-5°C) low
- Wettest month: August (18 rainy days) · Sunniest: June (10.9 h sun/day)
- Climate type: oceanic
- Annual swing: 10°C between the average warmest and coolest month · day to night: 6°C
- Snow: about 3 days a year
- Average humidity: 82%
Temperatures through the year
July is the warm end of the year, averaging 65°F (18°C) by day and 53°F (12°C) overnight. January bottoms out at 45°F (7°C) in daylight, 37°F (3°C) after dark. Relative humidity averages 82% across the year, more humid than 92% of the 3496 cities in our dataset.
Rain, sun and snow
Days and nights are about 6°C apart on average - narrower than all but 6% of the 3496 cities in our dataset. Snow falls on roughly 3 days a year, mostly January through March. Precipitation concentrates in August - 4.1 inches (104 mm) on 18 days - and thins out by April. The gridded 2015-2024 daily record for this location tops out at 81°F (27°C) and bottoms at 24°F (-5°C) - decade extremes, not all-time station records.
How Belfast compares
- The city sees 7.2 hours of sunshine on an average day - duller than all but 3% of the 3496 cities we track.
- Belfast averages 50°F (10°C) across the year - cooler than all but 9% of the 3496 cities we track.
- 29% of the year's precipitation falls in its wettest three months - more evenly spread than all but 9% of the 3496 cities we track.
Ranked against every city in our dataset, each measured on the same ten-year window.
Monthly climate table
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 45° | 37° | 14 | 2.7 in | 3.8 h/day | 86% |
| February | 47° | 38° | 14 | 3.1 in | 5.4 h/day | 83% |
| March | 49° | 38° | 16 | 3.2 in | 6.8 h/day | 82% |
| April | 52° | 41° | 13 | 2.4 in | 9.0 h/day | 79% |
| May | 58° | 46° | 14 | 2.8 in | 10.5 h/day | 78% |
| June | 63° | 51° | 14 | 3.2 in | 10.9 h/day | 78% |
| July | 65° | 53° | 18 | 3.9 in | 9.8 h/day | 80% |
| August | 64° | 54° | 18 | 4.1 in | 9.3 h/day | 82% |
| September | 61° | 51° | 14 | 3.4 in | 7.7 h/day | 83% |
| October | 56° | 47° | 14 | 3.5 in | 5.7 h/day | 84% |
| November | 50° | 42° | 14 | 3.5 in | 4.1 h/day | 86% |
| December | 47° | 40° | 15 | 3.9 in | 2.9 h/day | 88% |
Belfast month by month
Belfast weather in January
January brings highs around 45°F (7°C), lows near 37°F (3°C), about 14 wet days - typically the coldest month of the year in Belfast.
Belfast weather in February
February brings highs around 47°F (8°C), lows near 38°F (3°C), about 14 wet days and roughly 1 snowy days.
Belfast weather in March
March brings highs around 49°F (9°C), lows near 38°F (4°C), about 16 wet days.
Belfast weather in April
April brings highs around 52°F (11°C), lows near 41°F (5°C), about 13 wet days - typically the driest month of the year in Belfast.
Belfast weather in May
May brings highs around 58°F (15°C), lows near 46°F (8°C), about 14 wet days.
Belfast weather in June
June brings highs around 63°F (17°C), lows near 51°F (11°C), about 14 wet days - typically the sunniest month of the year in Belfast.
Belfast weather in July
July brings highs around 65°F (18°C), lows near 53°F (12°C), about 18 wet days - typically the hottest month of the year in Belfast.
Belfast weather in August
August brings highs around 64°F (18°C), lows near 54°F (12°C), about 18 wet days - typically the wettest month of the year in Belfast.
Belfast weather in September
September brings highs around 61°F (16°C), lows near 51°F (10°C), about 14 wet days.
Belfast weather in October
October brings highs around 56°F (13°C), lows near 47°F (8°C), about 14 wet days.
Belfast weather in November
November brings highs around 50°F (10°C), lows near 42°F (6°C), about 14 wet days.
Belfast weather in December
December brings highs around 47°F (8°C), lows near 40°F (4°C), about 15 wet days.
Seasons in Belfast
Spring (March through May)
Spring in Belfast is brisk and cold, with daytime highs averaging 53°F (12°C) and nights around 42°F (5°C); rain falls on around 43 of the 90 days.
Summer (June through August)
Summer in Belfast stays on the cool side of mild, with daytime highs averaging 64°F (18°C) and nights around 53°F (12°C); rain falls on around 49 of the 90 days. Daylight is generous - around 10.0 hours of sun a day.
Fall (September through November)
Fall in Belfast is mild, with daytime highs averaging 56°F (13°C) and nights around 47°F (8°C); rain falls on around 42 of the 90 days.
Winter (December through February)
Winter stays firmly cold here - highs near 46°F (8°C), nights near 38°F (4°C), and rain falls on around 42 of the 90 days.
Climate questions, answered
Is Belfast cold in winter?
How does Belfast compare to other cities?
How much sun does Belfast get?
How warm is Belfast on average?
How often does it rain in Belfast?
How humid does Belfast get?
Best time to visit Belfast
The best time to visit Belfast is generally April to September, when warm days, manageable rainfall and plenty of daylight line up. Daytime temperatures in that window sit near 60°F (16°C), with rain on about 15 days a month. For the same question asked the other way round, see where else is warm in April.
Pack for Belfast with a warm jacket and layers for the cooler season and proper waterproofs rather than an umbrella - wet days are the norm here. Even in July, lows of 53°F (12°C) make an extra layer worth the space.
Belfast temperature records (2015-2024)
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ.