Belfast Weather in September
17°C high · 9.2°C low · 75 mm rain · 4.3h sun
Sep is a warm month in Belfast — not peak season, but a good time to avoid crowds.
September at a glance
| Metric | Value |
|---|---|
| Average high | 17°C |
| Average low | 9.2°C |
| Rainfall | 75 mm |
| Sunshine | 4.3 hours/day |
| Daylight | 12.4 hours |
What to pack in September
Pack a jacket and layers for Belfast in September.
Belfast weather by month
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Frequently asked questions
What is the weather in Belfast in September?
Highs of 17°C and lows of 9.2°C, with about 75 mm of rain and 4.3 hours of sunshine per day.
Is September a good time to visit Belfast?
Sep is a warm month in Belfast — not peak season, but a good time to avoid crowds.
What to do in Belfast · Best time to visit Belfast
Climate data: Open-Meteo Historical (ERA5), 1991–2020. CC BY 4.0.