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Climate in Northern Ireland United Kingdom

Average daytime and nighttime temperatures


All climatic diagrams on this site result from the collected data from 2 measuring stations in Northern Ireland.
All data correspond to the average monthly values of the last 20 years.


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It rarely gets really warm here and you can safely leave your swimwear at home. Due to the warmer temperatures the best time for traveling is from July to August. Nearly unattractive for tourists are the cold months from November to March.
Overview: Climate in the United Kingdom
Daylengths and sun positions in the United Kingdom
Compare climate with other regions or countries
Hours of sunshine per daySunshine hours per day in Northern Ireland
The number of hours of sunshine refers to the time when the sun is actually visible. That is, without any obstruction of visibility by clouds, fog or mountains. With 7 hours per day, May is the sunniest month in country part Northern Ireland. In December the sun shines the shortest.
Rainy days per monthRainy days per month in Northern Ireland
A rainy day is a day on which at least an amount of 0.1 mm precipitation (=0.1 liter) per square meter falls. This can be rain, snow, hail or even dew. So it does not have to rain the whole day. With 18 rainy days, December offers the most number of rainy days, and in April the least.
Precipitation in mm/dayPrecipitation in Northern Ireland
The amount of precipitation is measured in millimeters per square meter. Thus, at 2 mm/day, 2 liters of water fall on one square meter within 24 hours. With only 1.7 mm, the least rain falls in April. November, on the other hand, has the most rain.
Water temperatureWater temperatures in Northern Ireland
Water temperature depends not only on solar radiation within the same region, but also on ocean currents. For example, depending on the season, cold or warm water masses are moved from other areas. The warmest temperatures in Northern Ireland are in September, when the water is 13 °C.
Relative humidity in %Relative humidity in Northern Ireland
Warm air can absorb more moisture than cold air. The relative humidity indicates how much moisture of the physically possible is actually contained in the air. At high humidity, the person feels uncomfortable and perceives this as oppressive. In general, a relative humidity of 40-60% gives as pleasant. With only 79% humidity on average, it is quite dry in May. The highest value of 93% is experienced here in December.
Absolute humidity in g/m³Absolute humidity in Northern Ireland
In warm months, there is also a higher absolute humidity almost everywhere. At a temperature of 25°C, air can absorb up to 23 grams of water per cubic meter. At 20°C, it is only 17.3 grams. A relative humidity of 40% at 25°C thus corresponds to an absolute humidity of 9.2 grams of water. From a proportion of approx. 13.5 grams, humans perceive the air as muggy.
Humidex in °CHumidex in Northern Ireland
The "Humidex" (humidity index) is an index of well-being in warmer areas, calculated from the air temperature, relative humidity and dew point. The index corresponds approximately to the temperature felt. At high temperatures, the body transports heat away by sweating. At high humidity the ambient air can only absorb a small amount of sweat and thus one feels uncomfortable. An index of 20-29 is considered comfortable. Up to 39, people perceive the air as slightly uncomfortable, and above 40, as very uncomfortable. Values above 45 are dangerous in the long run and often lead to heat stroke.
Climate charts for other country parts in the United Kingdom

Map of Northern Ireland

Most important cities in the country part »Northern Ireland«

The country part has a west-east extension of about 140 km and over 130 km from north to south.

CityPopulationGeo-Position
Belfast280,21154° 34' 60"N5° 55' 60"W
Derry83,65254° 59' 53"N7° 18' 34"W
Lisburn77,50654° 31' 24"N6° 2' 7"W
Newtownabbey63,86054° 39' 35"N5° 54' 31"W
Bangor60,38554° 39' 12"N5° 40' 8"W
Craigavon59,23654° 26' 50"N6° 23' 13"W
Castlereagh56,67954° 34' 25"N5° 53' 5"W
Newtownards29,36354° 35' 32"N5° 41' 27"W
Carrickfergus29,20854° 42' 57"N5° 48' 21"W
Ballymena28,93254° 51' 49"N6° 16' 35"W
Newry27,75754° 10' 42"N6° 20' 15"W
Coleraine25,68155° 7' 60"N6° 40' 0"W
Portadown22,00054° 25' 23"N6° 26' 40"W
Omagh21,05654° 36' 0"N7° 17' 60"W
Antrim19,66154° 42' 0"N6° 12' 0"W
Larne18,42154° 51' 0"N5° 49' 0"W
Banbridge16,17354° 21' 0"N6° 16' 60"W
Armagh14,80154° 21' 0"N6° 40' 0"W
Enniskillen14,47254° 20' 46"N7° 38' 29"W
Strabane14,19854° 49' 25"N7° 28' 9"W
Dundonald13,98554° 35' 31"N5° 47' 53"W
Holywood13,10954° 38' 19"N5° 49' 29"W
Limavady12,97055° 3' 2"N6° 57' 3"W
Dungannon11,93554° 30' 12"N6° 46' 2"W
Cookstown11,08154° 38' 35"N6° 44' 45"W
Downpatrick10,50754° 19' 41"N5° 42' 55"W
Ballymoney9,62555° 4' 15"N6° 30' 36"W
Ballyclare9,47254° 46' 0"N6° 1' 0"W
Comber9,19054° 32' 58"N5° 44' 38"W
Magherafelt9,15754° 45' 13"N6° 36' 24"W


Data basis: German Weather Service, individual values averaged and supplemented by own elements. Data on cities and inhabitants: geonames.org, United Nations Statistics Division and own research.
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