June
Best time
17.1°C / 10.8°C
14 rain days
mild, rainy
Best time to visit Belfast
Belfast, United Kingdom — ranked month by month from data: temperature, rainfall, snow, and peak hazard seasons. The standouts: June, September.
Best · June & September
About Belfast
Belfast is the capital, largest city and main port of Northern Ireland. It stands on the banks of the river Lagan, and is connected to the open sea through Belfast Lough and the North Channel. The city is the most populous in Northern Ireland and the second-largest, after Dublin, on the island of Ireland, with a recorded population in 2021 of 345,418 and of 704,406 for the greater metropolitan area.
— condensed from Wikipedia
Best months to visit
September
Best time
16.2°C / 10.7°C
14 rain days
mild, rainy
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OK — shoulder months
July
OK
18.2°C / 12°C
17 rain days
mild, very wet
- comfortable temperatures (avg high 18.2°C / 65°F)
August
OK
17.7°C / 12°C
17 rain days
mild, very wet
May
OK
14.3°C / 7.6°C
14 rain days
cool, rainy
October
OK
13.2°C / 8.5°C
15 rain days
cool, rainy
April
OK
11.1°C / 4.9°C
12 rain days
cool, rainy
November
OK
9.9°C / 5.6°C
15 rain days
chilly, rainy
March
OK
9.3°C / 3.5°C
16 rain days
chilly, very wet
December
OK
8.2°C / 4.2°C
15 rain days
chilly, rainy
February
OK
7.8°C / 3.2°C
15 rain days
chilly, rainy
January
OK
7.3°C / 3.1°C
14 rain days
chilly, rainy
How we ranked these
Each month is scored on temperature comfort (18–27°C avg high is the sweet spot), rainfall (more rain days = lower score), snow days, and peak hazard seasons (hurricanes, monsoons, etc.). Green-tier months are within ideal range with no major issues. Yellow are workable but with trade-offs. Red has at least one significant problem — extreme heat or cold, heavy rain, or peak storm season.