Hardly any UK towns collect more rain than Brynamman: 1,716 mm (68 in) a year
Sunny July days climb to about 19.9°C (68°F). Wet weather is most frequent in December and least in April. By July afternoons alone, it runs cooler than 77% of UK towns. Homes need heating from November to April, the months averaging under 10°C.
Met Office 1991–2020 averages for the town itself.
A year in Brynamman at a glance
Each month’s typical high and low, in °C.
What a year in Brynamman feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 1,716 mm of rain a year
December is the wettest month and April the driest. About 59 days a year bring 10 mm (0.4 in) or more. The wettest of 23 Dyfed towns of 2,500+.
Rain by month
Millimetres
38 air frosts and 6 days of 25°C a year
On about 38 nights a year the air drops below freezing, and on about under 1 days it stays below freezing all day. About 6 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 37 miles south-east of Brynamman, 9 m (30 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 |
|---|---|---|---|---|
| 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 Brynamman 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 Dyfed 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 |
|---|---|---|---|
| Brynamman | 19.9°C | 2.1°C | 1,716 mm |
| Gwaun-Cae-Gurwen 1.5 mi | 19.9°C about the same | 2.1°C about the same | 1,720 mm |
| Glanaman 1.9 mi | 19.9°C about the same | 2.3°C about the same | 1,713 mm |
| Cwmllynfell and Ystradowen 2.3 mi | 20.1°C about the same | 2.2°C about the same | 1,997 mm |
| Ystalyfera 4.8 mi | 20.3°C about the same | 2.2°C about the same | 1,920 mm |
| Ammanford 5.0 mi | 20.6°C 0.7°C warmer | 2.8°C 0.6°C milder | 1,522 mm |
| Ystradgynlais 5.4 mi | 20.3°C about the same | 2.2°C about the same | 1,923 mm |
Brynamman 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 | 7.5°C 45°F | 2.1°C 36°F | 4.8°C | 186 mm 7.3 in |
| February | 7.8°C 46°F | 1.9°C 35°F | 4.9°C | 138 mm 5.4 in |
| March | 9.7°C 49°F | 2.9°C 37°F | 6.3°C | 122 mm 4.8 in |
| April | 12.8°C 55°F | 4.7°C 41°F | 8.8°C | 97 mm 3.8 in |
| May | 15.8°C 61°F | 7.4°C 45°F | 11.6°C | 99 mm 3.9 in |
| June | 18.3°C 65°F | 10.2°C 50°F | 14.2°C | 106 mm 4.2 in |
| July | 19.9°C 68°F | 12.0°C 54°F | 15.9°C | 118 mm 4.6 in |
| August | 19.6°C 67°F | 12.0°C 54°F | 15.8°C | 138 mm 5.4 in |
| September | 17.4°C 63°F | 10.0°C 50°F | 13.6°C | 134 mm 5.3 in |
| October | 13.8°C 57°F | 7.5°C 45°F | 10.6°C | 189 mm 7.4 in |
| November | 10.3°C 51°F | 4.5°C 40°F | 7.3°C | 192 mm 7.6 in |
| December | 7.9°C 46°F | 2.4°C 36°F | 5.2°C | 198 mm 7.8 in |
| Year | 13.4°C | 6.5°C | 9.9°C | 1,716 mm |
Where Brynamman’s numbers come from
Averages over 30 years, not a forecast.
- Mean temperature, rain and day counts: HadUK-Grid 1991–2020 averages for the 1 Met Office 2 km grid square whose centre lies inside Brynamman’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, 37 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 Brynamman’s climate
How warm does Brynamman get in summer?
July is the warmest month, with average highs of 19.9°C (68°F). About 6 days a year reach 25°C (77°F), fewer than 73% of UK towns.
How cold does Brynamman get in winter?
February nights average 1.9°C (35°F). The air drops below freezing on about 38 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does Brynamman get?
About 1,716 mm (68 in) a year, more than 98% of UK towns. December is the wettest month (198 mm) and April the driest (97 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 Brynamman. 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 Brynamman →
Contains public sector information licensed under the Open Government Licence v3.0. Contains HM Land Registry data © Crown copyright and database right 2026. Contains OS data © Crown copyright and database right 2026 (ONS boundaries). Northern Ireland: Source: NISRA; contains Land & Property Services data and Ordnance Survey of Northern Ireland information, © Crown copyright, licensed under the Open Government Licence v3.0. Scotland: contains National Records of Scotland data, Registers of Scotland data and SEPA data, © Crown copyright / © SEPA 2025, licensed under the Open Government Licence v3.0.