One of the most favorable times to visit Belfast is during the late spring through to early autumn, from May to September. This period promises longer days and milder weather, making it ideal for exploring the city's outdoor attractions, such as the Botanic Gardens, or taking a day trip to the Giant's Causeway. Tourist activities are in full swing, and there’s a vibrant atmosphere in the city with numerous festivals and events taking place, such as the Belfast Film Festival or the Belsonic music festival.
However, if you're looking to experience the city's cultural events, St. Patrick's Day in March provides a lively, celebratory atmosphere that showcases Irish culture and heritage at its best. Additionally, if you don’t mind the cooler temperatures, visiting in the off-peak season, such as late autumn or winter, means fewer crowds and the opportunity to enjoy Belfast's Christmas markets and festive decorations. It's worth noting that while the weather may be more unpredictable, the warmth of Belfast's indoor attractions and hospitality is a constant comfort.
| Month | Min Temp | Max Temp |
|---|---|---|
| January | 2°C °c | 8°C °c |
| February | 2°C °c | 8°C °c |
| March | 3°C °c | 10°C °c |
| April | 5°C °c | 13°C °c |
| May | 7°C °c | 15°C °c |
| June | 10°C °c | 18°C °c |
| July | 12°C °c | 19°C °c |
| August | 12°C °c | 19°C °c |
| September | 10°C °c | 17°C °c |
| October | 8°C °c | 14°C °c |
| November | 5°C °c | 10°C °c |
| December | 3°C °c | 8°C °c |
