Belfast Weather & Climate: Best Time to Visit

In Belfast, seasonal changes bring about a moderate variation in temperatures. Average daytime temperatures reach a pleasant 20°C (68°F) in July. In January, the coolest month of the year, temperatures drop to a chilly 9°C (48°F).

At night, temperatures range from around 12°C (54°F) in July to 3°C (37°F) in January.

Check out our detailed temperature page for more information.

Temperature ranges by month

Generally, Belfast has a moderate amount of precipitation, averaging 974 mm (38 in) of rainfall annually. Despite minor fluctuations, Belfast enjoys fairly consistent precipitation throughout the year. In August, you can expect around 91 mm (3.6 in) of precipitation, while in March, Belfast receives about 69 mm (2.7 in). For more details, please visit our Belfast Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

Belfast can be enjoyed more throughout the sunniest month of May under a blue sky, with approximately 6.1 hours of sunshine daily. In contrast, the city experiences much darker days in December, with only 1.3 hours of sunlight per day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

Daily percentage of sunshine

The mean water temperature over the year ranges from 7°C (45°F) in February to 13°C (55°F) in August.

Water temperature over the year

The city experiences its highest humidity in September, reaching 91%. In February, the humidity drops to its lowest level at 86%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year

The average wind speed over the year ranges from 4 m/s (8 knots) to 5 m/s (10 knots). It is lower in April, May, June, July, August and September and higher in January, February, March, October, November and December. What does this mean?

The mean monthly wind speed over the year (meters per second)