Blaenau Ffestiniog sits near the top of UK towns for rain, with 2,332 mm (92 in) a year
Midwinter brings lows of about 1.4°C (34°F). In July, afternoons here are cooler than in 98% of UK towns. Winter and summer sit 17°C apart. Keep the boiler serviced for the months from November to April, which average under 10°C.
Met Office 1991–2020 averages for the town itself.
A year in Blaenau Ffestiniog at a glance
Each month’s typical high and low, in °C.
What a year in Blaenau Ffestiniog feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 2,332 mm of rain a year
January is the wettest month and April the driest. About 90 days a year bring 10 mm (0.4 in) or more. The wettest of 13 Gwynedd towns of 2,500+.
Rain by month
Millimetres
Sunshine by month
Hours of bright sunshine at Valley (Anglesey)
43 air frosts and 2 days of 25°C a year
On about 43 nights a year the air drops below freezing, and on about 3 days it stays below freezing all day. About 2 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 31 miles north-west of Blaenau Ffestiniog, 10 m (33 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 | 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 Blaenau Ffestiniog 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 |
|---|---|---|---|
| Blaenau Ffestiniog | 18.1°C | 1.4°C | 2,332 mm |
| Penrhyndeudraeth 6.9 mi | 19.5°C 1.3°C warmer | 3.1°C 1.7°C milder | 1,691 mm |
| Porthmadog 9.4 mi | 19.8°C 1.6°C warmer | 3.0°C 1.6°C milder | 1,329 mm |
| Harlech 11.5 mi | 19.5°C 1.3°C warmer | 3.2°C 1.8°C milder | 1,364 mm |
| Llanrwst 11.6 mi | 19.9°C 1.7°C warmer | 2.5°C 1.1°C milder | 1,516 mm |
| Llanberis 11.8 mi | 17.6°C 0.5°C cooler | 2.6°C 1.3°C milder | 2,530 mm |
Blaenau Ffestiniog 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 | 6.2°C 43°F | 1.4°C 34°F | 3.9°C | 284 mm 11.2 in |
| February | 6.8°C 44°F | 1.8°C 35°F | 4.5°C | 178 mm 7.0 in |
| March | 8.6°C 48°F | 2.6°C 37°F | 5.6°C | 167 mm 6.6 in |
| April | 11.6°C 53°F | 4.2°C 39°F | 7.8°C | 125 mm 4.9 in |
| May | 14.1°C 57°F | 6.6°C 44°F | 10.3°C | 139 mm 5.5 in |
| June | 16.7°C 62°F | 9.5°C 49°F | 13.0°C | 146 mm 5.7 in |
| July | 18.1°C 65°F | 11.4°C 53°F | 14.6°C | 166 mm 6.5 in |
| August | 17.9°C 64°F | 11.5°C 53°F | 14.9°C | 187 mm 7.3 in |
| September | 16.2°C 61°F | 9.8°C 50°F | 12.9°C | 193 mm 7.6 in |
| October | 13.0°C 55°F | 7.2°C 45°F | 10.1°C | 237 mm 9.3 in |
| November | 9.7°C 49°F | 4.5°C 40°F | 7.0°C | 245 mm 9.6 in |
| December | 7.5°C 45°F | 2.4°C 36°F | 5.0°C | 268 mm 10.6 in |
| Year | 12.2°C | 6.1°C | 9.1°C | 2,332 mm |
Where Blaenau Ffestiniog’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 Blaenau Ffestiniog’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, 31 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 Blaenau Ffestiniog’s climate
How warm does Blaenau Ffestiniog get in summer?
July is the warmest month, with average highs of 18.1°C (65°F). About 2 days a year reach 25°C (77°F), fewer than 91% of UK towns.
How cold does Blaenau Ffestiniog get in winter?
January nights average 1.4°C (34°F). The air drops below freezing on about 43 nights a year, and about 3 days a year stay below freezing all day.
How much rain does Blaenau Ffestiniog get?
About 2,332 mm (92 in) a year, more than almost every UK town. January is the wettest month (284 mm) and April the driest (125 mm).
How sunny is it?
The nearest Met Office station with a sunshine record, Valley (Anglesey) (31 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 Blaenau Ffestiniog. 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 Blaenau Ffestiniog →
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