Wet weather: 1,346 mm (53 in) a year falls on Gorseinon, more than on 94% of UK towns
Winter’s chill peaks in January, at about 3.0°C (37°F) after dark. By January nights alone, it runs milder than 93% of UK towns. Only 18°C separates winter nights from summer afternoons. Warm coats and heating bills mark the months from November to April, when means dip under 10°C.
Met Office 1991–2020 averages for the town itself.
A year in Gorseinon at a glance
Each month’s typical high and low, in °C.
What a year in Gorseinon feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 1,346 mm of rain a year
November is the wettest month and April the driest. About 47 days a year bring 10 mm (0.4 in) or more. 11th wettest of 19 West Glamorgan towns of 2,500+.
Rain by month
Millimetres
26 air frosts and 10 days of 25°C a year
On about 26 nights a year the air drops below freezing; days that stay below freezing are rare. About 10 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 39 miles east of Gorseinon, 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 Gorseinon 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 |
|---|---|---|---|
| Gorseinon | 21.0°C | 3.0°C | 1,346 mm |
| Loughor 1.0 mi | 21.0°C about the same | 3.0°C about the same | 1,267 mm |
| Grovesend 1.4 mi | 21.0°C about the same | 2.8°C about the same | 1,335 mm |
| Penllergaer 1.8 mi | 21.0°C about the same | 2.8°C about the same | 1,335 mm |
| Gowerton 1.9 mi | 21.0°C about the same | 3.0°C about the same | 1,345 mm |
| Llangennech 2.5 mi | 21.0°C about the same | 3.0°C about the same | 1,328 mm |
| Bryn 2.6 mi | 21.0°C about the same | 2.9°C about the same | 1,257 mm |
Gorseinon 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 | 8.3°C 47°F | 3.0°C 37°F | 5.6°C | 150 mm 5.9 in |
| February | 8.7°C 48°F | 2.8°C 37°F | 5.7°C | 101 mm 4.0 in |
| March | 10.7°C 51°F | 3.9°C 39°F | 7.3°C | 92 mm 3.6 in |
| April | 13.7°C 57°F | 5.6°C 42°F | 9.6°C | 77 mm 3.0 in |
| May | 16.8°C 62°F | 8.3°C 47°F | 12.5°C | 80 mm 3.1 in |
| June | 19.3°C 67°F | 11.1°C 52°F | 15.2°C | 81 mm 3.2 in |
| July | 21.0°C 70°F | 13.0°C 55°F | 16.9°C | 94 mm 3.7 in |
| August | 20.7°C 69°F | 12.9°C 55°F | 16.8°C | 110 mm 4.3 in |
| September | 18.5°C 65°F | 10.9°C 52°F | 14.7°C | 102 mm 4.0 in |
| October | 14.9°C 59°F | 8.3°C 47°F | 11.6°C | 152 mm 6.0 in |
| November | 11.3°C 52°F | 5.4°C 42°F | 8.3°C | 157 mm 6.2 in |
| December | 8.8°C 48°F | 3.3°C 38°F | 6.0°C | 151 mm 5.9 in |
| Year | 14.4°C | 7.4°C | 10.9°C | 1,346 mm |
Where Gorseinon’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 Gorseinon’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, 39 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 Gorseinon’s climate
How warm does Gorseinon get in summer?
July is the warmest month, with average highs of 21.0°C (70°F). About 10 days a year reach 25°C (77°F), fewer than 55% of UK towns.
How cold does Gorseinon get in winter?
February nights average 2.8°C (37°F). The air drops below freezing on about 26 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does Gorseinon get?
About 1,346 mm (53 in) a year, more than 94% of UK towns. November is the wettest month (157 mm) and April the driest (77 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 Gorseinon. 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 Gorseinon →
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