Home › Cities › United Kingdom › Northern Ireland › Coleraine
Coleraine, Northern Ireland climate
Cfb Oceanic / temperate
Coleraine has a mildly seasonal cool-temperate climate (Oceanic / temperate, Köppen Cfb). The hottest month is July with an average daily high near 65°F, while the coldest is January averaging around 36°F at night. Precipitation is fairly even year-round, totalling about 36 inches. At latitude 55°N, day length swings from 7.0 hours in midwinter to 17.0 hours at midsummer.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Coleraine climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 45 | 46 | 49 | 54 | 59 | 63 | 65 | 65 | 62 | 56 | 49 | 45 |
| Avg temp (°F) | 40 | 41 | 43 | 47 | 51 | 56 | 59 | 58 | 55 | 50 | 45 | 41 |
| Avg low (°F) | 36 | 36 | 37 | 40 | 44 | 49 | 52 | 52 | 49 | 45 | 40 | 36 |
| Precipitation (in) | 3.7 | 2.5 | 2.4 | 2.2 | 2.5 | 2.9 | 3.2 | 3.5 | 2.7 | 3.7 | 3.6 | 3.5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 45 | 46 | 49 | 54 | 59 | 63 |
| Avg temp (°F) | 40 | 41 | 43 | 47 | 51 | 56 |
| Avg low (°F) | 36 | 36 | 37 | 40 | 44 | 49 |
| Precipitation (in) | 3.7 | 2.5 | 2.4 | 2.2 | 2.5 | 2.9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 65 | 65 | 62 | 56 | 49 | 45 |
| Avg temp (°F) | 59 | 58 | 55 | 50 | 45 | 41 |
| Avg low (°F) | 52 | 52 | 49 | 45 | 40 | 36 |
| Precipitation (in) | 3.2 | 3.5 | 2.7 | 3.7 | 3.6 | 3.5 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 79 | 79 | 80 | 78 | 76 | 81 | 81 | 80 | 78 | 77 | 78 | 78 |
| Relative humidity (%) | 91 | 90 | 88 | 86 | 84 | 85 | 86 | 86 | 87 | 88 | 90 | 91 |
| Wind speed (mph) | 13.4 | 13.0 | 11.9 | 10.4 | 9.6 | 8.8 | 8.5 | 9.0 | 10.4 | 11.7 | 12.4 | 12.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 79 | 79 | 80 | 78 | 76 | 81 |
| Relative humidity (%) | 91 | 90 | 88 | 86 | 84 | 85 |
| Wind speed (mph) | 13.4 | 13.0 | 11.9 | 10.4 | 9.6 | 8.8 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 81 | 80 | 78 | 77 | 78 | 78 |
| Relative humidity (%) | 86 | 86 | 87 | 88 | 90 | 91 |
| Wind speed (mph) | 8.5 | 9.0 | 10.4 | 11.7 | 12.4 | 12.6 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 26 years of daily observations at Portglenone, a weather station, about 33 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.