The best time to visit Belfast is June, July and August, when average highs sit near 17.3 °C in June and 18.5 °C in July and daylight stretches longest — June alone gets 10.8 hours of sunshine a day. These are Belfast's warmest, brightest months, though July and August fall within school-holiday peak season, when the city and its attractions like Titanic Belfast are busiest. The quiet, low season runs across winter, when highs drop to 7.3 °C in January and sunshine falls to around 3 hours a day.
Best months JuneJulyAugust
Belfast month by month
Average highs and lows (°C), 2016–2025. Highlighted bars are the best months.
| Month | High | Low | Rain days | Sun / day |
|---|---|---|---|---|
| January | 7.3 °C | 2.9 °C | 13 | 3.8 h |
| February | 8.1 °C | 3.3 °C | 14 | 5.2 h |
| March | 9.5 °C | 3.6 °C | 16 | 6.8 h |
| April | 11.3 °C | 4.9 °C | 13 | 9 h |
| May | 15 °C | 7.8 °C | 13 | 10.9 h |
| June | 17.3 °C | 10.7 °C | 15 | 10.8 h |
| July | 18.5 °C | 12 °C | 17 | 9.9 h |
| August | 18.2 °C | 12.1 °C | 18 | 9.4 h |
| September | 16.1 °C | 10.4 °C | 15 | 7.6 h |
| October | 13.1 °C | 8.4 °C | 14 | 5.5 h |
| November | 9.8 °C | 5.4 °C | 14 | 4.3 h |
| December | 8.2 °C | 4.1 °C | 14 | 3 h |
How the months are picked.A month qualifies when its average high sits in the comfortable 20–28 °C band (scored down towards 9 °C and 37 °C), rain days are few and sunshine hours are high — at least 78 % of the city's best-scoring month. July and August are then set aside as peak season (school-holiday crowds and prices) whenever at least three other months qualify; where summer is the only comfortable window they stay. Figures are ten-year averages (2016-01-01 to 2025-12-31) from ERA5 reanalysis data via Open-Meteo (CC BY 4.0) for the city centre coordinates.
When to go, and what to expect
Spring (Mar–May)
A pleasant, lighter-crowd choice for those who don't need full summer warmth.
Summer (Jun–Aug)
The best overall time to visit, if you accept crowds and occasional rain.
Autumn (Sep–Nov)
September still feels mild and works well for a calmer trip.
Winter (Dec–Feb)
For indoor culture and festive atmosphere rather than weather.
Notable events
- March
- St Patrick's Day celebrations
- Autumn (October–November)
- Belfast International Arts Festival
- November–December
- Belfast Christmas Market at City Hall
- Summer (July–August)
- Belfast TradFest (traditional music)
Frequently asked
Is Belfast too hot in August?
No. August highs average 18.2 °C, comfortably mild, though it's the wettest month with 18 rain days, so pack for showers.
What is the rainiest month in Belfast?
August, with 18 rain days, closely followed by July with 17. Rain is frequent year-round, so waterproofs are always worth bringing.
Is winter worth visiting Belfast?
It depends. Winter is cold and dark, with December highs of 8.2 °C and only 3 hours of sunshine a day, but the Christmas market and indoor attractions make it rewarding if weather isn't your priority.
Know when to go? Now decide where to stay — our Belfast area guide →
Areas of Belfast
Best time to visit near here
Sources
- Open-Meteo historical weather API — monthly climate normals, 2016–2025 (CC BY 4.0)
- ERA5 reanalysis (ECMWF / Copernicus) — the underlying temperature, precipitation and sunshine data
- ReasonStay methodology — how the best months are computed and checked
An independent guide to Belfast — honest, verified, no invented data. Climate figures: ERA5 via Open-Meteo, 2016–2025 averages; the best months are computed from them, not opinion.