Weather in Belfast in September
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Compare car hire prices → Affiliate link — we earn a commission at no extra cost to youIn September, Belfast sees average highs of 16.9°C (62.4°F) and lows of 10.9°C. Conditions are cool and fairly wet (15 rainy days on average), with roughly 7.8 hours of sunshine a day. It is one of the best months of the year to visit. For the complete picture, see the best time to visit Belfast — every month compared. Once you know when to go, find your Belfast packing list at 247PackingList.
Get ready for Belfast in September
Search flights to Belfast
Compare 100+ airlines for September — one search, best price.
Search Flights →Travel clothing layers
Pack layers — temperatures can vary significantly between day and night.
Check Price →What to pack for Belfast in September
- Warm layers
- Light jacket or fleece
- Comfortable walking shoes
- Compact travel umbrella
- Waterproof jacket
- Quick-dry clothing
Compare all months in Belfast
| Month | High | Rain | Rating |
|---|---|---|---|
| January | 7.4°C | 62.0mm | 10/10 |
| February | 8.3°C | 104.7mm | 9/10 |
| March | 9.7°C | 69.1mm | 10/10 |
| April | 11.4°C | 49.2mm | 10/10 |
| May | 14.4°C | 75.5mm | 10/10 |
| June | 17.8°C | 95.2mm | 10/10 |
| July | 18.4°C | 97.7mm | 10/10 |
| August | 18.4°C | 105.2mm | 9/10 |
| September | 16.9°C | 110.3mm | 9/10 |
| October | 13.5°C | 130.3mm | 9/10 |
| November | 10.4°C | 80.9mm | 10/10 |
| December | 7.6°C | 107.8mm | 9/10 |
Full month-by-month guide: best time to visit Belfast →
For facts about United Kingdom — currency, language and dialling code — see our United Kingdom country guide at 247CountryInfo. Travellers also find it useful to keep a Belfast travel guide to hand. Check clothing sizes in United Kingdom before you shop.
Frequently Asked Questions
Is September a good time to visit Belfast?
September rates 9/10 for visiting Belfast — excellent time to visit. Expect average highs of 16.9°C, 110.3mm of rain across the month and about 7.8 hours of daily sunshine.
What is the temperature in Belfast in September?
In September, Belfast has average highs of 16.9°C (62.4°F) and average lows of 10.9°C (51.6°F).
Does it rain in Belfast in September?
Some rain is likely. Belfast averages 110.3mm across about 15 rainy days in September, so a light waterproof layer is worth packing.
What should I wear in Belfast in September?
For Belfast in September (16.9°C highs / 10.9°C lows), pack warm layers plus light jacket or fleece, comfortable walking shoes, compact travel umbrella.
More essentials for Belfast in September
Packing cubes
Keep the bag organised whatever the weather — compression cubes for every size.
Check Price →Travel first aid kit
Compact TSA-friendly kit for peace of mind wherever you travel.
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Climate data sourced from Open-Meteo (open source, open data licence). Monthly averages calculated from 2020–2023 historical data. Weather can be unpredictable — always check a live forecast before travelling.