Hardly any UK towns wake to less frost than Larne
High summer brings afternoon highs near 19.0°C (66°F). Summers stay cool: July afternoons here are cooler than in 92% of UK towns. Expect the heaviest rain in January and the lightest in May. Homes need heating from November to April, the months averaging under 10°C.
Met Office 1991–2020 averages for the town itself.
A year in Larne at a glance
Each month’s typical high and low, in °C.
What a year in Larne feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 957 mm of rain a year
January is the wettest month and May the driest. About 28 days a year bring 10 mm (0.4 in) or more. 7th wettest of 8 Mid and East Antrim towns of 2,500+.
Rain by month
Millimetres
10 air frosts and under 1 days of 25°C a year
On about 10 nights a year the air drops below freezing; days that stay below freezing are rare. About under 1 days a year reach 25°C (77°F).
Day counts are 1991–2020 averages from the Met Office’s 2 km grid. The Met Office calls a day of 25°C or more a summer day and a night below 0°C an air frost; ground frosts, on grass, come more often.
The Met Office station at Ballypatrick Forest
Ballypatrick Forest is 26 miles north-west of Larne, 156 m (512 ft) above sea level. It is the nearest of the 37 long-running stations the Met Office publishes in full; at that distance read it for sunshine and the station’s own record, not as the town’s figures.
| Month | High | Low | Rain | Air frosts |
|---|---|---|---|---|
| January | 7.0°C | 2.5°C | 132 mm | 4.8 |
| February | 7.2°C | 2.5°C | 106 mm | 4.2 |
| March | 8.6°C | 2.9°C | 97 mm | 3.8 |
| April | 10.7°C | 4.4°C | 80 mm | 1.6 |
| May | 13.4°C | 6.5°C | 80 mm | 0.1 |
| June | 15.6°C | 9.1°C | 86 mm | 0.0 |
| July | 17.0°C | 10.8°C | 97 mm | 0.0 |
| August | 16.9°C | 10.9°C | 109 mm | 0.0 |
| September | 15.3°C | 9.6°C | 100 mm | 0.0 |
| October | 12.3°C | 7.2°C | 143 mm | 0.2 |
| November | 9.2°C | 4.7°C | 151 mm | 1.7 |
| December | 7.3°C | 2.9°C | 146 mm | 4.3 |
| Year | 11.7°C | 6.2°C | 1,326 mm | 21 |
Met Office historic station data, Ballypatrick Forest, 1991–2020 months averaged (a month needs 20 of the 30 years; estimated values counted, missing months left out). Sunshine: Campbell-Stokes recorder.
How Larne compares
Against the 2,537 towns and cities of 2,500 or more across the UK, each with its own Met Office averages, and its place among Mid and East Antrim towns that size.
Nearby towns’ climate
The nearest towns of 1,000+ within 12 miles: a hill, a valley or the sea can make a real difference over a few miles.
| Town | July high | January low | Rain a year |
|---|---|---|---|
| Larne | 19.0°C | 3.4°C | 957 mm |
| Whitehead 8.4 mi | 18.7°C about the same | 2.9°C about the same | 942 mm |
| Carrickfergus 9.0 mi | 19.3°C about the same | 2.6°C 0.8°C colder | 981 mm |
| Ballyclare 9.9 mi | 19.0°C about the same | 1.6°C 1.7°C colder | 1,085 mm |
| Greenisland 11.2 mi | 19.6°C 0.7°C warmer | 2.9°C 0.5°C colder | 979 mm |
Larne weather by month
Average daily high and low, mean temperature and rain, 1991–2020, for the town itself (the Met Office’s HadUK-Grid).
| Month | High | Low | Mean | Rain |
|---|---|---|---|---|
| January | 8.2°C 47°F | 3.4°C 38°F | 5.8°C | 106 mm 4.2 in |
| February | 8.7°C 48°F | 3.3°C 38°F | 6.0°C | 82 mm 3.2 in |
| March | 10.4°C 51°F | 4.1°C 39°F | 7.2°C | 72 mm 2.8 in |
| April | 12.5°C 55°F | 5.5°C 42°F | 9.0°C | 57 mm 2.2 in |
| May | 15.1°C 59°F | 7.4°C 45°F | 11.2°C | 55 mm 2.2 in |
| June | 17.7°C 64°F | 10.0°C 50°F | 13.8°C | 65 mm 2.6 in |
| July | 19.0°C 66°F | 11.6°C 53°F | 15.3°C | 74 mm 2.9 in |
| August | 18.8°C 66°F | 11.9°C 53°F | 15.4°C | 78 mm 3.1 in |
| September | 17.1°C 63°F | 10.5°C 51°F | 13.8°C | 69 mm 2.7 in |
| October | 14.0°C 57°F | 8.2°C 47°F | 11.1°C | 101 mm 4.0 in |
| November | 10.9°C 52°F | 5.8°C 42°F | 8.3°C | 98 mm 3.9 in |
| December | 8.8°C 48°F | 3.8°C 39°F | 6.3°C | 100 mm 3.9 in |
| Year | 13.4°C | 7.1°C | 10.3°C | 957 mm |
Where Larne’s numbers come from
Averages over 30 years, not a forecast.
- Mean temperature, rain and day counts: HadUK-Grid 1991–2020 averages for the 1 Met Office 2 km grid square whose centre lies inside Larne’s settlement.
- Highs and lows: the Met Office publishes average daily maxima and minima on its 12 km grid; each is moved by the difference between the town’s 2 km mean temperature and the 12 km square’s, which carries the town’s own height and setting over.
- Weather station and sunshine: Met Office historic station data for Ballypatrick Forest, 26 miles away, months of 1991–2020 averaged.
- Comparisons: every town and city of 2,500 or more across the UK, all four nations, read the same way.
Met Office HadUK-Grid · Met Office Climate Data Portal · Historic station data. Open Government Licence v3.0.
Questions about Larne’s climate
How warm does Larne get in summer?
July is the warmest month, with average highs of 19.0°C (66°F). About under 1 days a year reach 25°C (77°F), fewer than almost every UK town.
How cold does Larne get in winter?
February nights average 3.3°C (38°F). The air drops below freezing on about 10 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does Larne get?
About 957 mm (38 in) a year, more than 75% of UK towns. January is the wettest month (106 mm) and May the driest (55 mm).
Where do these figures come from?
The Met Office’s HadUK-Grid 1991–2020 averages, which turn thousands of weather stations into a map of the UK in 2 km squares; the page reads the squares inside Larne. They are 30-year averages, not a forecast.
Contains Met Office data © Crown copyright 2026, Open Government Licence v3.0. HadUK-Grid 1991–2020 averages via the Met Office Climate Data Portal; station averages from Met Office historic station data. Today’s forecast for Larne →
Contains public sector information licensed under the Open Government Licence v3.0. Contains HM Land Registry data © Crown copyright and database right 2026. Contains OS data © Crown copyright and database right 2026 (ONS boundaries). Northern Ireland: Source: NISRA; contains Land & Property Services data and Ordnance Survey of Northern Ireland information, © Crown copyright, licensed under the Open Government Licence v3.0. Scotland: contains National Records of Scotland data, Registers of Scotland data and SEPA data, © Crown copyright / © SEPA 2025, licensed under the Open Government Licence v3.0.