Rainfall in Cwmbrân tops that of 95% of UK towns: 1,416 mm (56 in) a year
Expect July afternoons of about 21.7°C (71°F). Of all months, January brings the most rain and April the least. Central heating does most of its work from November to April, in months below 10°C on average.
Met Office 1991–2020 averages for the town itself.
A year in Cwmbrân at a glance
Each month’s typical high and low, in °C.
What a year in Cwmbrân feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 1,416 mm of rain a year
January is the wettest month and April the driest. About 50 days a year bring 10 mm (0.4 in) or more. 28th wettest of 38 Gwent towns of 2,500+.
Rain by month
Millimetres
43 air frosts and 11 days of 25°C a year
On about 43 nights a year the air drops below freezing, and on about 1 days it stays below freezing all day. About 11 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 13 miles south-west of Cwmbrân, 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 Cwmbrân 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 Gwent 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 |
|---|---|---|---|
| Cwmbrân | 21.7°C | 1.8°C | 1,416 mm |
| Ponthir 2.9 mi | 22.3°C 0.7°C warmer | 2.3°C about the same | 1,116 mm |
| Pontypool 3.2 mi | 20.9°C 0.8°C cooler | 1.6°C about the same | 1,540 mm |
| Caerleon 3.6 mi | 22.1°C about the same | 2.3°C about the same | 1,116 mm |
| Risca 4.1 mi | 21.4°C about the same | 1.7°C about the same | 1,372 mm |
| Rogerstone 4.2 mi | 21.5°C about the same | 2.1°C about the same | 1,242 mm |
| Abercarn 4.4 mi | 20.5°C 1.2°C cooler | 1.5°C about the same | 1,452 mm |
Cwmbrân 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 | 7.7°C 46°F | 1.8°C 35°F | 4.7°C | 167 mm 6.6 in |
| February | 8.2°C 47°F | 1.7°C 35°F | 4.9°C | 117 mm 4.6 in |
| March | 10.6°C 51°F | 3.0°C 37°F | 6.8°C | 102 mm 4.0 in |
| April | 13.8°C 57°F | 4.6°C 40°F | 9.2°C | 82 mm 3.2 in |
| May | 17.0°C 63°F | 7.4°C 45°F | 12.1°C | 88 mm 3.5 in |
| June | 19.9°C 68°F | 10.3°C 51°F | 15.0°C | 84 mm 3.3 in |
| July | 21.7°C 71°F | 12.1°C 54°F | 16.9°C | 89 mm 3.5 in |
| August | 21.1°C 70°F | 11.9°C 53°F | 16.5°C | 109 mm 4.3 in |
| September | 18.5°C 65°F | 9.7°C 49°F | 14.1°C | 105 mm 4.1 in |
| October | 14.5°C 58°F | 7.2°C 45°F | 10.8°C | 153 mm 6.0 in |
| November | 10.6°C 51°F | 4.2°C 39°F | 7.3°C | 154 mm 6.0 in |
| December | 8.1°C 47°F | 2.2°C 36°F | 5.1°C | 165 mm 6.5 in |
| Year | 14.3°C | 6.3°C | 10.3°C | 1,416 mm |
Where Cwmbrân’s numbers come from
Averages over 30 years, not a forecast.
- Mean temperature, rain and day counts: HadUK-Grid 1991–2020 averages for the 3 Met Office 2 km grid squares whose centre lies inside Cwmbrân’s built-up area.
- 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, 13 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 Cwmbrân’s climate
How warm does Cwmbrân get in summer?
July is the warmest month, with average highs of 21.7°C (71°F). About 11 days a year reach 25°C (77°F), more than 53% of UK towns.
How cold does Cwmbrân get in winter?
February nights average 1.7°C (35°F). The air drops below freezing on about 43 nights a year, and about 1 days a year stay below freezing all day.
How much rain does Cwmbrân get?
About 1,416 mm (56 in) a year, more than 95% of UK towns. January is the wettest month (167 mm) and April the driest (82 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 Cwmbrân. 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 Cwmbrân →
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