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Swansea Weather Today: Live Forecast, Climate Guide & What to Expect Year-Round
Swansea is a city in South Wales with a maritime climate that is mild (Koppen classification Cfb). There are no extremes of temperature or rainfall throughout the year. The average annual temperature for the city is 10-11degC. July, the warmest month with temperatures nearing 20degC and February being the coldest. Swansea has one of Wales’ wettest cities, with an annual rainfall average of 1,300-1.334″ (51-53″) inches. It is recommended that visitors planning to visit Swansea Bay or the Gower peninsula, or Mumbles check the live Swansea forecast before leaving, because coastal conditions can change rapidly due to the city’s position on Bristol Channel.
Swansea, a Maritime City on the Coastal Coast
Swansea’s weather is determined by the Bristol Channel and Atlantic Ocean. Oceanic airflows are responsible for preventing winters that can be harsh, and keeping summers comfortable rather than extremely hot. Central Swansea rarely experiences frost, and the thermometer rarely dips below -2degC or above 25degC during summer. Orographic rainfall is caused by the hills surrounding the city. This means that moist Atlantic Air rises, releasing precipitation on the region. Swansea receives twice the amount of rainfall as London.
Swansea Weather – Seasons
Spring (March-May).
Spring has gradually warmer days with fewer days of rain than winter. Swansea has historically experienced the lowest humidity and lowest rainfall in April, with 83mm. In March, the daytime temperature rises from about 10degC to around 16degC.
Summer (June – August)
Swansea’s summer is the best of the whole year. July is the most sunny and hot month of the year, with highs averaging 19-20degC. (66-68degF). There are up to 6.7 daily hours of sunlight. The Bristol Channel sea temperatures peak in August at 17degC – 63degF. Swansea Bay is a popular beach for paddleboarders, swimmers, and surfers. Swansea’s best months to visit are July and August, when you can enjoy beach trips, outdoor events, and coastal watersports.
Autumn (September – November)
September offers comfortable temperatures at the sea and warm days of around 17degC. This extends the outdoor season. The rainfall increases sharply from October, with an average of 17-18 days of rain in November. The south-westerly breezes intensify as winter approaches.
Winter (December – February)
Swansea weather in winter is usually cold, rainy, and gray, but it’s rarely harsh. Around 110 mm rain fell over approximately 20 days in January. Only 1.6 hour of sunshine per day is available in December. Swansea does not get much snow, but higher grounds in the Brecon Beacons near it can. Swansea is still a great city in any weather. Indoor attractions like the National Waterfront Museum or Swansea Grand Theatre are available.
Monthly Swansea Weather: Averages of Temperature, Rainfall and Summary
Residents, tourists, and weather enthusiasts can find key climate information for Swansea in South Wales on this monthly overview. Understanding the changes in weather patterns across Swansea throughout the year is helpful for everything from planning holidays to preparing for daily commutes.
- January: 8°C high / 4°C low | Rainfall: ~110 mm | Sunshine: ~2 hrs/day — Coldest, wettest start to the year
- February: 8°C high / 4°C low | Rainfall: ~95 mm | Sunshine: ~2.5 hrs/day — Slightly drier but still cold
- March: 10°C high / 5°C low | Rainfall: ~90 mm | Sunshine: ~3.5 hrs/day — Early spring; mild improvement
- April: 13°C high / 6°C low | Rainfall: ~83 mm | Sunshine: ~5 hrs/day — Driest month of the year
- May: 16°C high / 9°C low | Rainfall: ~75 mm | Sunshine: ~6 hrs/day — Warm and pleasant
- June: 18°C high / 11°C low | Rainfall: ~85 mm | Sunshine: ~6.5 hrs/day — Ideal for outdoor visits
- July: 20°C high / 13°C low | Rainfall: ~98 mm | Sunshine: ~6.7 hrs/day — Hottest and sunniest month
- August: 20°C high / 14°C low | Rainfall: ~105 mm | Sunshine: ~6 hrs/day — Peak beach season
- September: 17°C high / 11°C low | Rainfall: ~100 mm | Sunshine: ~4.5 hrs/day — Warm sea, cooler air
- October: 13°C high / 8°C low | Rainfall: ~115 mm | Sunshine: ~3 hrs/day — Rainfall increases
- November: 10°C high / 6°C low | Rainfall: ~112 mm | Sunshine: ~2 hrs/day — Wet and windy
- December: 8°C high / 4°C low | Rainfall: ~146 mm | Sunshine: ~1.6 hrs/day — Darkest and wettest month
These monthly averages reflect Swansea’s maritime character. This widget updates the figures in real-time. It shows the current temperature, wind speed and atmospheric pressure for Swansea.
Swansea Weather FAQs
Is Swansea often rainy?
Yes. Swansea has an annual average rainfall of around 1,300-1.334″ mm, spread over approximately 180-200 wet days. This is much higher than London with its 600 mm. Atlantic weather systems from the south-west travel inland and deposit heavy rain against the hills surrounding London, a phenomenon known as “orographic uplift”.
When is the best weather to visit Swansea in order to enjoy good weather?
Swansea has the best weather between July and August. This is because they have the highest temperatures, most sunshine hours and the warmest sea temperatures in Swansea Bay. Also, late May and June offer a pleasant climate and less crowds.
Does it Snow in Swansea?
It is very rare to see snow lying in central Swansea. Due to its coastal location and low elevation, the city experiences temperatures that are above freezing in winter. Snowfall is most likely in the Brecon Beacons mountains and in the South Wales valleys to the north of the city.
What is the weather like in Swansea and Cardiff?
Yes, in general. But due to the fact that Swansea is located on a more exposed west coast, it tends to record higher rainfall. Both cities enjoy mild winters, moderately hot summers, and a year-round climate of precipitation. This is typical for a Welsh coastal climate.
Weather for Swansea, Live!
Swansea Evening Post provides all the weather information needed for residents and visitors to plan their days, whether it’s a morning commute or a weekend in Rhossili Bay. The widget below provides live weather data from Swansea updated every hour. It includes current conditions and a 7-day outlook, as well as hourly precipitation charts. Save this page to your favorites for the most accurate, localized Swansea weather available online.