Northern Ireland climate
World Climates covers 1 place in Northern Ireland. Belfast has a temperate oceanic climate (Köppen Cfb).
Climate of Belfast at a glance
The year average in Belfast is 10 °C50 °F. The warmest month is August, with an average high of 17 °C63 °F. The coldest is February, with an average low of 4 °C40 °F. About 1,068 mm42 in of precipitation falls in a year. October is the wettest month and April the driest. By our comfort score, the best months to visit are June–September.
Frequently asked questions
How many places in Northern Ireland does this site cover?
World Climates has climate data for one place in Northern Ireland: Belfast. Its page has monthly averages for temperature, rainfall, humidity and daylight.
What is the warmest month in Belfast?
August is the warmest month, with an average high of 17 °C63 °F. February is the coldest, with an average low of 4 °C40 °F.
When does it rain the most in Belfast?
October is the wettest month, with about 116 mm4.6 in of precipitation. The yearly total is about 1,068 mm42 in.
When is the best time to visit Belfast?
By our comfort score, the most comfortable months are June–September. The score is based on long-term averages, not on a forecast.
Climate of every place in Northern Ireland
| Place | Year | Max high | Min low | Precip. |
|---|---|---|---|---|
| Belfast | 10 | 17 | 4 | 1,068 |
Year = annual mean temperature; max high = average high of the warmest month; min low = average low of the coldest month; precip. = annual total. Temperatures in °C°F, precipitation in mminches. Sorted by population.
Data: NASA POWER climatology 2001–2025 (MERRA-2 reanalysis, CERES satellite data) — grid-cell averages, not station records. Sources and method.