September · United Kingdom
Best time to visit Belfast in September Weather, crowds & prices
Weather in Belfast in September
Average temperature 13°C, 106 mm of rain, about 20 days with 6+ hours of sunshine and 83% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
7.3/10
Ranked #5 of 12 months
- Avg temp
- 13°C
- Rainfall
- 106 mm
- Humidity
- 83%
- Days with 6h+ sun
- 20
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
September in Belfast scores 7.3/10 for sightseeing and cultural travel - an above-average month (#5 of 12). Expect around 13°C, 106 mm of rain, and roughly 20 days with 6+ hours of sunshine this month.
Belfast's Titanic Quarter, Cathedral Quarter, and political murals trace a shipbuilding city remaking its waterfront.
September holds up well in Belfast — 5th best month
Temperatures hover around 13°C (56°F) — the kind of month where neither heat nor cold forces the schedule.
106 mm of rain makes this a wet month here, though with about 20 days with 6+ hours of sunshine there is still bright weather between the fronts.
That is 7.3/10 on the same scale — 5th of 12 months, versus 8.1/10 for the best month here.
Pack layers you can shed by midday plus one warm layer for the evening, a proper rain shell rather than an umbrella.
Expect mid-season pricing, and crowds are moderate.
Frequently asked
- What is the weather like in Belfast in September?
- In September, Belfast averages 13°C, 106 mm of rain, and about 20 days with 6+ hours of sunshine. Its climate-comfort score is 7.3/10.
- Is September a good time to visit Belfast?
- September earns a 7.3/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Belfast in September?
- Expect about 106 mm of rain in September. Average humidity is 83% and there are about 20 days with 6+ hours of sunshine.
Curated in Belfast
Tickets & experiences
Things to do in Belfast
Belfast, United Kingdom. Live activities and tours from GetYourGuide, matched to this destination.