Photo: Jaggery · CC BY-SA 2.0Cymmer is among the wettest of UK towns: 2,110 mm (83 in) of rain a year
Winter’s chill peaks in January, at about 1.8°C (35°F) after dark. Its July afternoons stay fresher than in 93% of UK towns. From frosty January to warm July, readings climb 18°C. Gritters and ice scrapers earn their keep on roughly 45 nights a year below 0°C.
Met Office 1991–2020 averages for the town itself.
A year in Cymmer at a glance
Each month’s typical high and low, in °C.
What a year in Cymmer feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 2,110 mm of rain a year
January is the wettest month and April the driest. About 80 days a year bring 10 mm (0.4 in) or more.
Rain by month
Millimetres
45 air frosts and 4 days of 25°C a year
On about 45 nights a year the air drops below freezing, and on about 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 Cardiff Bute Park
Cardiff Bute Park is 23 miles south-east of Cymmer, 9 m (30 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 |
|---|---|---|---|---|
| January | 8.6°C | 2.5°C | 127 mm | 8.1 |
| February | 9.1°C | 2.5°C | 93 mm | 7.5 |
| March | 11.3°C | 3.9°C | 85 mm | 3.9 |
| April | 14.4°C | 5.7°C | 72 mm | 1.4 |
| May | 17.4°C | 8.5°C | 78 mm | 0.0 |
| June | 20.1°C | 11.3°C | 73 mm | 0.0 |
| July | 21.8°C | 13.1°C | 84 mm | 0.0 |
| August | 21.4°C | 12.9°C | 105 mm | 0.0 |
| September | 19.1°C | 10.7°C | 87 mm | 0.0 |
| October | 15.2°C | 8.0°C | 128 mm | 1.0 |
| November | 11.6°C | 4.9°C | 131 mm | 3.7 |
| December | 9.1°C | 2.9°C | 140 mm | 8.3 |
| Year | 14.9°C | 7.2°C | 1,201 mm | 34 |
Met Office historic station data, Cardiff Bute Park, 1991–2020 months averaged (a month needs 20 of the 30 years; estimated values counted, missing months left out). Sunshine: Campbell-Stokes recorder.
How Cymmer 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 West Glamorgan 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 |
|---|---|---|---|
| Cymmer | 18.9°C | 1.8°C | 2,110 mm |
| Croeserw 0.7 mi | 19.0°C about the same | 1.6°C about the same | 2,409 mm |
| Maesteg 2.9 mi | 18.8°C about the same | 2.1°C about the same | 2,076 mm |
| Blaengarw 3.3 mi | 18.4°C about the same | 1.5°C about the same | 2,483 mm |
| Pontycymer 4.1 mi | 18.7°C about the same | 1.2°C 0.6°C colder | 2,483 mm |
| Resolven 4.5 mi | 18.2°C 0.7°C cooler | 2.4°C 0.6°C milder | 2,293 mm |
| Pont Rhyd-y-cyff 4.6 mi | 19.7°C 0.8°C warmer | 2.3°C 0.6°C milder | 1,732 mm |
Cymmer 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 | 7.2°C 45°F | 1.8°C 35°F | 4.5°C | 241 mm 9.5 in |
| February | 6.9°C 44°F | 1.2°C 34°F | 4.1°C | 160 mm 6.3 in |
| March | 9.0°C 48°F | 2.3°C 36°F | 5.6°C | 139 mm 5.5 in |
| April | 11.6°C 53°F | 3.5°C 38°F | 7.6°C | 117 mm 4.6 in |
| May | 15.0°C 59°F | 6.6°C 44°F | 10.8°C | 120 mm 4.7 in |
| June | 17.1°C 63°F | 8.8°C 48°F | 12.9°C | 135 mm 5.3 in |
| July | 18.9°C 66°F | 10.9°C 52°F | 14.8°C | 171 mm 6.7 in |
| August | 18.5°C 65°F | 10.9°C 52°F | 14.7°C | 180 mm 7.1 in |
| September | 16.5°C 62°F | 9.1°C 48°F | 12.8°C | 162 mm 6.4 in |
| October | 12.9°C 55°F | 6.5°C 44°F | 9.7°C | 224 mm 8.8 in |
| November | 9.4°C 49°F | 3.8°C 39°F | 6.6°C | 228 mm 9.0 in |
| December | 7.3°C 45°F | 1.8°C 35°F | 4.6°C | 234 mm 9.2 in |
| Year | 12.5°C | 5.6°C | 9.1°C | 2,110 mm |
Where Cymmer’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 Cymmer’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 Cardiff Bute Park, 23 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 Cymmer’s climate
How warm does Cymmer get in summer?
July is the warmest month, with average highs of 18.9°C (66°F). About 4 days a year reach 25°C (77°F), fewer than 81% of UK towns.
How cold does Cymmer get in winter?
February nights average 1.2°C (34°F). The air drops below freezing on about 45 nights a year, and about 1 days a year stay below freezing all day.
How much rain does Cymmer get?
About 2,110 mm (83 in) a year, more than almost every UK town. January is the wettest month (241 mm) and April the driest (117 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 Cymmer. 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 Cymmer →
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