Weather · Belfast, United Kingdom
Belfast Weather in September
September in Belfast averages 17°C by day and 11°C at night, with about 118mm of rain. That makes it a reasonable time to visit.
Avg high
17°C
63°F
Avg low
11°C
52°F
Rainfall
118mm
#2 wettest of 12
What to pack
Layers, plus a jacket for mornings and nights. Bring a compact umbrella for the odd shower.
Timing a trip around the weather? A Local Friend in Belfast builds it around the season for you.