Hardly any UK towns collect more rain than Llanberis: 2,530 mm (100 in) a year
Midwinter brings lows of about 2.6°C (37°F). By July afternoons alone, it runs cooler than almost every UK town. Only 16°C separates winter nights from summer afternoons. Expect about 22 frosty starts a year, nights when the air falls below freezing.
Met Office 1991–2020 averages for the town itself.
A year in Llanberis at a glance
Each month’s typical high and low, in °C.
What a year in Llanberis feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 2,530 mm of rain a year
December is the wettest month and May the driest. About 72 days a year bring 10 mm (0.4 in) or more.
Rain by month
Millimetres
Sunshine by month
Hours of bright sunshine at Valley (Anglesey)
22 air frosts and 4 days of 25°C a year
On about 22 nights a year the air drops below freezing, and on about under 1 days it stays below freezing all day. About 4 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 Valley (Anglesey)
Valley (Anglesey) is 19 miles north-west of Llanberis, 10 m (33 ft) above sea level. It is the nearest of the 37 long-running stations the Met Office publishes in full.
| Month | High | Low | Rain | Air frosts | Sun (hours) |
|---|---|---|---|---|---|
| January | 8.4°C | 3.8°C | 75 mm | 5.2 | 58 |
| February | 8.4°C | 3.6°C | 62 mm | 4.8 | 81 |
| March | 9.8°C | 4.5°C | 57 mm | 2.4 | 126 |
| April | 12.1°C | 6.1°C | 54 mm | 0.5 | 173 |
| May | 15.0°C | 8.6°C | 52 mm | 0.0 | 219 |
| June | 17.2°C | 11.0°C | 57 mm | 0.0 | 203 |
| July | 18.8°C | 12.9°C | 58 mm | 0.0 | 190 |
| August | 18.8°C | 13.1°C | 69 mm | 0.0 | 176 |
| September | 17.3°C | 11.6°C | 74 mm | 0.0 | 143 |
| October | 14.3°C | 9.2°C | 102 mm | 0.1 | 101 |
| November | 11.3°C | 6.6°C | 104 mm | 0.7 | 59 |
| December | 9.1°C | 4.4°C | 94 mm | 4.2 | 46 |
| Year | 13.4°C | 8.0°C | 857 mm | 18 | 1,575 |
Met Office historic station data, Valley, 1991–2020 months averaged (a month needs 20 of the 30 years; estimated values counted, missing months left out). Sunshine: Kipp & Zonen recorder.
How Llanberis 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 Gwynedd 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 |
|---|---|---|---|
| Llanberis | 17.6°C | 2.6°C | 2,530 mm |
| Clwt-y-bont 1.9 mi | 18.9°C 1.3°C warmer | 2.7°C about the same | 2,028 mm |
| Llanrug 3.2 mi | 19.3°C 1.6°C warmer | 3.1°C about the same | 1,597 mm |
| Bethel 4.6 mi | 19.3°C 1.6°C warmer | 3.1°C about the same | 1,569 mm |
| Tregarth 5.1 mi | 18.5°C 0.9°C warmer | 3.0°C about the same | 1,629 mm |
| Bethesda 5.1 mi | 17.5°C about the same | 2.6°C about the same | 2,116 mm |
| Y Felinheli 5.5 mi | 20.0°C 2.4°C warmer | 3.4°C 0.7°C milder | 1,076 mm |
Llanberis 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 | 7.6°C 46°F | 2.6°C 37°F | 5.2°C | 216 mm 8.5 in |
| February | 6.8°C 44°F | 1.5°C 35°F | 4.1°C | 208 mm 8.2 in |
| March | 8.3°C 47°F | 2.2°C 36°F | 5.2°C | 182 mm 7.2 in |
| April | 10.5°C 51°F | 3.8°C 39°F | 7.2°C | 147 mm 5.8 in |
| May | 13.8°C 57°F | 6.5°C 44°F | 10.1°C | 145 mm 5.7 in |
| June | 16.0°C 61°F | 9.0°C 48°F | 12.5°C | 165 mm 6.5 in |
| July | 17.6°C 64°F | 10.8°C 51°F | 14.1°C | 184 mm 7.2 in |
| August | 17.3°C 63°F | 10.9°C 52°F | 14.1°C | 210 mm 8.3 in |
| September | 15.6°C 60°F | 9.3°C 49°F | 12.4°C | 198 mm 7.8 in |
| October | 12.4°C 54°F | 6.8°C 44°F | 9.6°C | 281 mm 11.0 in |
| November | 9.3°C 49°F | 4.4°C 40°F | 6.9°C | 286 mm 11.3 in |
| December | 7.2°C 45°F | 2.3°C 36°F | 4.9°C | 308 mm 12.1 in |
| Year | 11.9°C | 5.8°C | 8.9°C | 2,530 mm |
Where Llanberis’s numbers come from
Averages over 30 years, not a forecast.
- Mean temperature, rain and day counts: HadUK-Grid 1991–2020 averages for the Met Office 2 km grid square nearest Llanberis’s centre (the town is smaller than one square).
- 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 Valley, 19 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 Llanberis’s climate
How warm does Llanberis get in summer?
July is the warmest month, with average highs of 17.6°C (64°F). About 4 days a year reach 25°C (77°F), fewer than 83% of UK towns.
How cold does Llanberis get in winter?
February nights average 1.5°C (35°F). The air drops below freezing on about 22 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does Llanberis get?
About 2,530 mm (100 in) a year, more than almost every UK town. December is the wettest month (308 mm) and May the driest (145 mm).
How sunny is it?
The nearest Met Office station with a sunshine record, Valley (Anglesey) (19 miles away), averages 1,575 hours of bright sunshine a year. Sunshine isn’t on the town grid, so this is the station’s figure.
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 Llanberis. 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 Llanberis →
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.