Climate Insights for Belfast

The climate in Belfast is cool. The average annual temperature is 8°C and approximately 1146mm 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 Febbraio, Gennaio, Dicembre, when temperatures can drop to -8°C. Snowfall occurs from January to December, with around 144cm accumulating over the season.

Temperatures in Belfast vary considerably across the year, with a 33°C difference between the coldest and warmest months. Luglio is the warmest month, though highs remain moderate at 25°C with a mean of 20°C. The coldest month is Febbraio, when overnight lows fall to -8°C and the daily average is -4°C. Daily temperature variation is modest, with an average difference of 8°C between highs and lows. The sharpest temperature change occurs between October and November, with a 6°C shift in average temperatures.

Belfast is a moderately rainy area, receiving approximately 1146mm of precipitation annually, which averages out to around 96mm per month. The wettest month is December, averaging 134mm of rainfall. October and April also tend to see above-average precipitation. The driest month is July, with just 76mm. That's 58mm less than December, 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 144cm accumulating over the season. January typically sees the most snow at around 36cm.

Belfast is mildly breezy, with an average annual wind speed of 20km/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 23km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in August, with average winds dropping to 16km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 7km/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 22km/h in winter, 21km/h in spring, 17km/h in summer, 19km/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 25°C, while the coldest stretch bottoms out in Febbraio near -8°C. Spring is next, beginning on March 20, 2026 — 2 days from now.

The best time to visit Belfast is during Giugno, Luglio, Agosto and Settembre, when the weather is most comfortable for travellers. During these months, average temperatures hover around 18°C with modest rainfall averaging 85mm per month. By contrast, Febbraio can be quite cold with temperatures dropping to -8°C. Despite being the best months overall, some rain is still likely — pack a waterproof layer and plan a mix of indoor and outdoor activities.

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.