Climate in Belfast — Annual Weather Overview
Belfast has a oceanic climate — mild temperatures year-round with regular rainfall. The hottest month is July (average high 18.4°C) and the coolest is January (7.4°C). There is a noticeable seasonal temperature shift of 11.0°C between July and January. Annual rainfall totals around 1088mm. October is the wettest month at 130.3mm, while April averages just 49.2mm. Average daily sunshine is 7.2 hours.
**Spring (March, April, May):** average highs 11.8°C, 194mm rain. **Summer (June, July, August):** average highs 18.2°C, 298mm rain. **Autumn (September, October, November):** average highs 13.6°C, 322mm rain. **Winter (December, January, February):** average highs 7.8°C, 274mm rain.
Belfast — Monthly Temperatures
Belfast — Monthly Rainfall
✅ Best months to visit
All year
ℹ️ No months to avoid
Weather in Belfast stays reasonable all year.
Belfast weather by month
| Month | High | Low | Rain | Sun/day | Rainy days | Rating |
|---|---|---|---|---|---|---|
| January | 7.4°C | 2.9°C | 62.0mm | 3.9h | 10 | 10/10 |
| February | 8.3°C | 3.6°C | 104.7mm | 5.1h | 15 | 9/10 |
| March | 9.7°C | 3.5°C | 69.1mm | 6.9h | 15 | 10/10 |
| April | 11.4°C | 4.4°C | 49.2mm | 9.7h | 11 | 10/10 |
| May | 14.4°C | 7.3°C | 75.5mm | 10.7h | 14 | 10/10 |
| June | 17.8°C | 10.9°C | 95.2mm | 10.9h | 15 | 10/10 |
| July | 18.4°C | 11.8°C | 97.7mm | 9.6h | 17 | 10/10 |
| August | 18.4°C | 12.1°C | 105.2mm | 9.6h | 17 | 9/10 |
| September | 16.9°C | 10.9°C | 110.3mm | 7.8h | 15 | 9/10 |
| October | 13.5°C | 8.6°C | 130.3mm | 5.5h | 18 | 9/10 |
| November | 10.4°C | 5.7°C | 80.9mm | 4.4h | 14 | 10/10 |
| December | 7.6°C | 3.6°C | 107.8mm | 2.9h | 16 | 9/10 |
For the full verdict on when to go, see the best time to visit Belfast. Seasonal breakdowns: spring, summer, autumn and winter.
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Frequently Asked Questions
What type of climate does Belfast have?
Belfast has a oceanic climate — mild temperatures year-round with regular rainfall. Average highs range from 7.4°C in January to 18.4°C in July.
What is the hottest month in Belfast?
July is the hottest month in Belfast, with average highs of 18.4°C and lows of 11.8°C.
What is the coldest month in Belfast?
January is the coolest month, with average highs of 7.4°C and lows of 2.9°C.
What is the wettest month in Belfast?
October is the wettest month, averaging 130.3mm of rainfall over around 18 rainy days.
How much rain does Belfast get per year?
Belfast receives around 1088mm of rain per year. The driest month is April (49.2mm).
When is the best time to visit Belfast?
The best time to visit Belfast is All year. See the full month-by-month guide →
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Trip essentials for Belfast
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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.