Belfast in September
6.4out of 10
Possible, with caveats
Mild: highs around 16°C. Frequent rain: about 13 rainy days.
16°CAvg high
11°CAvg low
13Rainy days (70 mm)
12:25 hDaylight
07:06Sunrise · 19:31 Sunset
Why this score
- Mild: highs around 16°C
- Frequent rain: about 13 rainy days
- Rain varies a lot between years (±4.9 days)
What to wear and pack
- Layers you can add or remove
- Rain jacket or compact umbrella
How reliable is the forecast?
Rain in September varies a lot between years (±4.9 rainy days), so check the forecast closer to your trip. Averages cover 30 years (1991–2020). Individual days can differ a lot.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 7°C | 4°C | 77 mm | 14 | – | – | 4.8 |
| February | 8°C | 3°C | 63 mm | 12 | – | – | 5.1 |
| March | 9°C | 4°C | 62 mm | 14 | – | – | 5.2 |
| April | 11°C | 6°C | 65 mm | 13 | – | – | 5.6 |
| May | 14°C | 8°C | 70 mm | 14 | – | – | 5.9 |
| June | 16°C | 10°C | 75 mm | 13 | – | – | 6.4 |
| July | 18°C | 12°C | 81 mm | 14 | – | – | 6.4 |
| August | 18°C | 12°C | 81 mm | 14 | – | – | 6.5 |
| September | 16°C | 11°C | 70 mm | 13 | – | – | 6.4 |
| October | 13°C | 8°C | 86 mm | 13 | – | – | 5.8 |
| November | 10°C | 6°C | 85 mm | 14 | – | – | 5.2 |
| December | 8°C | 4°C | 82 mm | 13 | – | – | 5.0 |
Frequently asked questions
How hot is Belfast in September?
Daytime highs average 16°C and nights about 11°C.
When is the best time to visit Belfast?
The best months are August, June, July, September.