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Weather & Climate in Swansea, United Kingdom
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Swansea experiences four distinct seasons with an average annual temperature of 51°F (10°C). Winters average 42°F in January while summers reach 62°F in July. The area gets 256 sunny days per year, above the national average. Annual precipitation totals 44.3 inches. The city sits at an elevation of 59 feet.
Temperature
42°F Jan (5°C)
62°F Jul (17°C)
| Annual Average | 50.8°F |
| 6% below US avg | |
| January Average | 42°F (5°C) |
| July Average | 62°F (17°C) |
| Sunny Days | 256 days/yr |
Geography
| Elevation | 59 ft (18 m) |
| Area | 150.6 sq mi (390.0 km²) |
| Population Density | 1,995/sq mi |
| Coordinates | 51.6208°N, 3.9432°W |
| Timezone | Europe/London |
Precipitation & Snow
Air Quality
Earthquake History
32 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.7.
| Apr 2, 1990 | 4 km NNE of Presteigne, United Kingdom | M4.7 | 101 km | 18 km |
| Oct 25, 1999 | 10 km N of Hirwaun, United Kingdom | M4.5 | 37 km | 10 km |
| Feb 17, 2018 | 5 km NE of Clydach, United Kingdom | M4.3 | 13 km | 12 km |
| Feb 20, 2014 | 17 km NNW of Ilfracombe, United Kingdom | M4.1 | 33 km | 3 km |
| May 31, 2001 | 20 km NNW of Flexbury, United Kingdom | M4.0 | 87 km | 29 km |
| May 29, 2013 | 14 km WSW of Nefyn, United Kingdom | M3.8 | 150 km | 10 km |
| Jan 29, 2004 | 2 km E of North Petherton, United Kingdom | M3.7 | 89 km | 7 km |
| Jan 1, 1994 | Wales-England region, United Kingdom | M3.6 | 52 km | 10 km |
| Jan 29, 2004 | 2 km E of North Petherton, United Kingdom | M3.6 | 89 km | 7 km |
| Mar 17, 1994 | 5 km WNW of Newtown, United Kingdom | M3.5 | 109 km | 10 km |
| Feb 12, 2002 | 1 km SSE of Deri, United Kingdom | M3.5 | 48 km | 8 km |
| Oct 10, 2001 | 2 km SSE of Caerphilly, United Kingdom | M3.5 | 52 km | 10 km |
| Jun 20, 2002 | 3 km N of Marshfield, United Kingdom | M3.4 | 60 km | 14 km |
| Feb 24, 2023 | 1 km ENE of Brynmawr, United Kingdom | M3.4 | 58 km | 10 km |
| Sep 23, 1992 | 1 km NNE of Tiverton, United Kingdom | M3.3 | 84 km | 10 km |
| Jun 16, 1991 | 11 km WSW of Knighton, United Kingdom | M3.3 | 92 km | 10 km |
| Jul 30, 1999 | 2 km ENE of Bargoed, United Kingdom | M3.3 | 52 km | 6 km |
| Jan 29, 2004 | 2 km E of North Petherton, United Kingdom | M3.3 | 89 km | 7 km |
| Oct 16, 1997 | 4 km ENE of Torquay, United Kingdom | M3.2 | 131 km | 10 km |
| Sep 17, 1993 | 3 km S of Leominster, United Kingdom | M3.2 | 104 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tsunami History
1 tsunami recorded within 500 km. Highest wave on record: 0.4 m (1 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 2011 | PLYMOUTH, ENGLAND | Avalanche | 0.4 m | — | 141 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 42°F (5°C) | 4.7 in | |
| February | 41°F (5°C) | 3.3 in | Coldest |
| March | 44°F (7°C) | 3.5 in | |
| April | 48°F (9°C) | 2.6 in | |
| May | 53°F (12°C) | 2.6 in | Driest |
| June | 58°F (15°C) | 2.8 in | |
| July | 62°F (17°C) | 2.8 in | Warmest |
| August | 62°F (17°C) | 3.5 in | |
| September | 58°F (14°C) | 3.9 in | |
| October | 52°F (11°C) | 4.6 in | |
| November | 47°F (8°C) | 5.1 in | Wettest |
| December | 44°F (6°C) | 4.9 in |
Swansea has a seasonal temperature swing of 21°F / from 41°F in February to 62°F in July. Total annual precipitation is 44.3 inches, with November being the wettest month (5.1") and May the driest (2.6").