Glyncorrwg is among the wettest of UK towns: 2,353 mm (93 in) of rain a year
Midwinter brings lows of about 1.0°C (34°F). The rainiest month is December; the driest is May. Its July afternoons stay fresher than in 98% of UK towns. Plan time outside for July and August, when highs sit at 18°C.
Met Office 1991–2020 averages for the town itself.
A year in Glyncorrwg at a glance
Each month’s typical high and low, in °C.
What a year in Glyncorrwg feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 2,353 mm of rain a year
December is the wettest month and May the driest. About 83 days a year bring 10 mm (0.4 in) or more.
Rain by month
Millimetres
A frosty town: 55 air frosts and 3 days of 25°C a year
On about 55 nights a year the air drops below freezing, and on about 3 days it stays below freezing all day. About 3 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 Glyncorrwg, 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 Glyncorrwg 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 |
|---|---|---|---|
| Glyncorrwg | 18.2°C | 1.0°C | 2,353 mm |
| Croeserw 2.4 mi | 19.0°C 0.8°C warmer | 1.6°C 0.6°C milder | 2,409 mm |
| Resolven 3.7 mi | 18.2°C about the same | 2.4°C 1.4°C milder | 2,293 mm |
| Treherbert 3.7 mi | 18.0°C about the same | 1.2°C about the same | 2,687 mm |
| Cwmgwrach 3.9 mi | 20.7°C 2.5°C warmer | 2.4°C 1.4°C milder | 1,605 mm |
| Blaengarw 4.1 mi | 18.4°C about the same | 1.5°C about the same | 2,483 mm |
| Glyn-neath 4.7 mi | 20.7°C 2.5°C warmer | 2.4°C 1.4°C milder | 1,605 mm |
Glyncorrwg 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 | 6.4°C 44°F | 1.0°C 34°F | 3.7°C | 260 mm 10.3 in |
| February | 6.2°C 43°F | 0.5°C 33°F | 3.4°C | 186 mm 7.3 in |
| March | 8.3°C 47°F | 1.5°C 35°F | 4.9°C | 167 mm 6.6 in |
| April | 10.9°C 52°F | 2.8°C 37°F | 6.9°C | 134 mm 5.3 in |
| May | 14.2°C 58°F | 5.8°C 42°F | 10.0°C | 130 mm 5.1 in |
| June | 16.4°C 62°F | 8.0°C 46°F | 12.1°C | 144 mm 5.7 in |
| July | 18.2°C 65°F | 10.2°C 50°F | 14.1°C | 178 mm 7.0 in |
| August | 17.7°C 64°F | 10.1°C 50°F | 13.9°C | 189 mm 7.4 in |
| September | 15.8°C 60°F | 8.4°C 47°F | 12.1°C | 182 mm 7.2 in |
| October | 12.2°C 54°F | 5.8°C 42°F | 9.0°C | 256 mm 10.1 in |
| November | 8.8°C 48°F | 3.1°C 38°F | 5.9°C | 257 mm 10.1 in |
| December | 6.7°C 44°F | 1.3°C 34°F | 4.0°C | 271 mm 10.7 in |
| Year | 11.8°C | 4.9°C | 8.3°C | 2,353 mm |
Where Glyncorrwg’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 Glyncorrwg’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 Glyncorrwg’s climate
How warm does Glyncorrwg get in summer?
July is the warmest month, with average highs of 18.2°C (65°F). About 3 days a year reach 25°C (77°F), fewer than 89% of UK towns.
How cold does Glyncorrwg get in winter?
February nights average 0.5°C (33°F). The air drops below freezing on about 55 nights a year, and about 3 days a year stay below freezing all day.
How much rain does Glyncorrwg get?
About 2,353 mm (93 in) a year, more than almost every UK town. December is the wettest month (271 mm) and May the driest (130 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 Glyncorrwg. 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 Glyncorrwg →
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