Hardly any UK towns collect more rain than Heol-y-Cyw: 1,589 mm (63 in) a year
A clear January night here typically dips to 2.1°C (36°F). Temperatures cover 18°C across the year, low to high. In January, nights here are milder than in 71% of UK towns. Garden chairs stay out from June to September, the months with highs of 18–20°C.
Met Office 1991–2020 averages for the town itself.
A year in Heol-y-Cyw at a glance
Each month’s typical high and low, in °C.
What a year in Heol-y-Cyw feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 1,589 mm of rain a year
December is the wettest month and April the driest. About 57 days a year bring 10 mm (0.4 in) or more.
Rain by month
Millimetres
40 air frosts and 8 days of 25°C a year
On about 40 nights a year the air drops below freezing, and on about under 1 days it stays below freezing all day. About 8 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 15 miles east of Heol-y-Cyw, 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 Heol-y-Cyw 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 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 |
|---|---|---|---|
| Heol-y-Cyw | 20.4°C | 2.1°C | 1,589 mm |
| Pencoed 1.6 mi | 20.4°C about the same | 2.3°C about the same | 1,574 mm |
| Sarn 2.6 mi | 20.6°C about the same | 2.3°C about the same | 1,487 mm |
| Llangeinor 2.8 mi | 19.9°C 0.6°C cooler | 1.6°C about the same | 2,045 mm |
| Pen-y-fai 3.1 mi | 20.7°C about the same | 2.4°C about the same | 1,376 mm |
| Llanharan and Brynna 3.2 mi | 20.7°C about the same | 2.1°C about the same | 1,448 mm |
| Bridgend 3.2 mi | 20.7°C about the same | 2.6°C 0.5°C milder | 1,399 mm |
Heol-y-Cyw 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 | 7.9°C 46°F | 2.1°C 36°F | 5.0°C | 164 mm 6.5 in |
| February | 8.1°C 47°F | 2.1°C 36°F | 5.1°C | 125 mm 4.9 in |
| March | 10.3°C 51°F | 3.2°C 38°F | 6.8°C | 113 mm 4.4 in |
| April | 13.2°C 56°F | 4.8°C 41°F | 9.0°C | 91 mm 3.6 in |
| May | 16.4°C 61°F | 7.4°C 45°F | 11.9°C | 92 mm 3.6 in |
| June | 18.8°C 66°F | 10.2°C 50°F | 14.5°C | 94 mm 3.7 in |
| July | 20.4°C 69°F | 12.2°C 54°F | 16.3°C | 118 mm 4.6 in |
| August | 20.2°C 68°F | 11.9°C 53°F | 16.2°C | 134 mm 5.3 in |
| September | 18.1°C 65°F | 10.0°C 50°F | 14.0°C | 122 mm 4.8 in |
| October | 14.5°C 58°F | 7.4°C 45°F | 11.0°C | 175 mm 6.9 in |
| November | 10.9°C 52°F | 4.8°C 41°F | 7.8°C | 178 mm 7.0 in |
| December | 8.4°C 47°F | 2.6°C 37°F | 5.5°C | 185 mm 7.3 in |
| Year | 13.9°C | 6.6°C | 10.2°C | 1,589 mm |
Where Heol-y-Cyw’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 Heol-y-Cyw’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, 15 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 Heol-y-Cyw’s climate
How warm does Heol-y-Cyw get in summer?
July is the warmest month, with average highs of 20.4°C (69°F). About 8 days a year reach 25°C (77°F), fewer than 64% of UK towns.
How cold does Heol-y-Cyw get in winter?
January nights average 2.1°C (36°F). The air drops below freezing on about 40 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does Heol-y-Cyw get?
About 1,589 mm (63 in) a year, more than 97% of UK towns. December is the wettest month (185 mm) and April the driest (91 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 Heol-y-Cyw. 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 Heol-y-Cyw →
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