Climate Insights for Belfast

The climate in Belfast is temperate. The average annual temperature is 12°C and approximately 1224mm of precipitation falls per year. Belfast receives a notable amount of rainfall throughout the year, including during its driest month. Belfast is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: Luglio, Agosto, Giugno. The coldest months are Gennaio, Febbraio, Dicembre, when temperatures can drop to -4°C. Snowfall occurs from January to December, with around 72cm accumulating over the season.

Temperatures in Belfast vary considerably across the year, with a 34°C difference between the coldest and warmest months. The warmest month is Luglio, when average highs reach 30°C and the mean temperature sits around 24°C. The coldest month is Gennaio, when overnight lows fall to -4°C and the daily average is 0°C. On average, daily temperatures fluctuate by about 9°C between overnight lows and afternoon highs. The sharpest temperature change occurs between October and November, with a 7°C shift in average temperatures.

Belfast is a fairly wet location, receiving approximately 1224mm of precipitation annually, which averages out to around 102mm per month. The wettest month is August, averaging 115mm of rainfall. July and December also tend to see above-average precipitation. The driest month is November, with just 85mm. That's 31mm less than August, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around. Snowfall is a regular feature from January to December, with around 72cm accumulating over the season. February typically sees the most snow at around 20cm.

Belfast is mildly breezy, with an average annual wind speed of 15km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is March, averaging 18km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, with average winds dropping to 12km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 6km/h gap between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 17km/h in winter, 17km/h in spring, 13km/h in summer, 15km/h in autumn.

It is currently winter in Belfast, which began on December 21, 2026. Belfast is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in Luglio at around 30°C, while the coldest stretch bottoms out in Gennaio near -4°C. Spring is next, beginning on March 20, 2026 — 2 days from now.

The table below shows monthly climate averages for Belfast based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.