Belfast weather forecast
UK towns · Northern Ireland · 54.60°N 5.93°W
Belfast, in Northern Ireland, has its warmest weather in August, when daytime temperatures average 18.3°C, while January nights are the coldest at around 2.8°C. The town sees roughly 1068mm of rain a year; October is normally the wettest month and January the driest. Figures are averaged from 2020–2024 observations.
Climate averages
| Month | Avg high | Avg low | Rain | Rain days |
|---|---|---|---|---|
| Jan | 7.3° | 2.8° | 60mm | 11 |
| Feb | 8.6° | 3.6° | 96mm | 15 |
| Mar | 9.6° | 3.6° | 80mm | 17 |
| Apr | 11.4° | 4.5° | 62mm | 13 |
| May | 14.8° | 7.8° | 76mm | 15 |
| Jun | 17.4° | 10.5° | 87mm | 15 |
| Jul | 18.2° | 11.6° | 98mm | 18 |
| Aug | 18.3° | 11.9° | 113mm | 18 |
| Sep | 16.6° | 10.6° | 100mm | 13 |
| Oct | 13.4° | 8.7° | 120mm | 18 |
| Nov | 10.4° | 5.7° | 75mm | 13 |
| Dec | 8° | 3.9° | 101mm | 15 |
Seasons in Belfast
Spring (March–May). Daytime highs in Belfast climb from 9.6°C in March to 14.8°C by May, while nights ease from 3.6°C to 7.8°C. The season brings around 218mm of rain in total.
Summer (June–August). The warmest stretch of the year: afternoons average 18.0°C, peaking in August at 18.3°C. June is usually the driest of the summer months (87mm over ~15 rainy days). Around the June solstice, Belfast gets roughly 17.0 hours of daylight.
Autumn (September–November). Daytime temperatures fall from 16.6°C in September to 10.4°C by November, and rainfall builds to its annual peak — October is the wettest month of the year (120mm).
Winter (December–February). Nights average 3.4°C, with January the coldest month (average low 2.8°C, daytime high 7.3°C). Expect about 41 days with measurable rain over the three months, and only around 7.0 hours of daylight in mid-December.
How Belfast compares
| Belfast | UK town average | |
|---|---|---|
| Annual rainfall | 1068mm | 1054mm |
| Rainy days per year | 181 | 167 |
| Summer daytime high | 18.0°C | 19.7°C |
| Winter night low | 3.4°C | 3.4°C |
Belfast is almost exactly in line with the average for the 121 UK towns tracked on this site (1054mm), based on 2020–2024 monthly normals.
Belfast weather FAQs
What is the warmest month in Belfast?
August is typically the warmest month in Belfast, with average daytime highs of 18.3°C. Summer afternoons (June–August) average around 18.0°C.
What is the wettest month in Belfast?
October is usually the wettest month, with around 120mm of rain over roughly 18 rainy days. January is typically the driest (60mm).
How much does it rain in Belfast per year?
Belfast receives roughly 1068mm of precipitation per year, spread over about 181 days with at least 1mm of rain (based on 2020–2024 observations).
How cold are winters in Belfast?
Winter nights (December–February) in Belfast average around 3.4°C, with January typically the coldest month (average low 2.8°C).
When is the best time to visit Belfast for good weather?
Late spring and summer offer the most reliable weather in Belfast. June is typically the driest of the warm months (87mm of rain), while August is the warmest, averaging 18.3°C by day — and near the June solstice there are around 17 hours of daylight to enjoy.
How does Belfast's weather compare with the rest of the UK?
Belfast receives 1068mm of rain a year, almost exactly in line with the average for the 121 UK towns tracked on this site (1054mm). Summer daytime highs average 18.0°C against a UK-town average of 19.7°C, and winter nights average 3.4°C versus 3.4°C.
Is it going to rain in Belfast?
For up-to-the-minute rain tracking, check the live rain radar — as a long-term guide, Belfast averages 181 rainy days a year, with October the wettest month (120mm) and January the driest (60mm).
What is the 7-day forecast for Belfast?
See the live hourly and 7-day forecast for day-by-day temperatures and rain chance. The figures on this page are long-term climate averages from 2020–2024, not the live forecast.