Swansea Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Swansea.
Climate overview of Swansea
The climate in Swansea, Wales, United Kingdom, sees a moderate range of temperatures across the year, from 20°C (68°F) in August down to 9°C (48°F) in January.
Rainfall is high, totalling around 1334 mm (53 in) per year. December is the wettest month and April the driest. The city also experiences pleasant summers and cold winters. July is the sunniest month, averaging 6.7 hours of sunshine per day.
Swansea Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Swansea - and find the best time to visit.
Monthly Temperature in Swansea
In Swansea, seasonal changes bring about a moderate variation in temperatures. Average maximum daytime temperatures range from a pleasant 20°C (68°F) in August, the warmest time of the year, to a chilly 9°C (48°F) during cooler months like January.
At night, you can expect temperatures ranging from 14°C (57°F) in August to around 4°C (39°F) during January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Swansea
Swansea experiences significant rainfall throughout the year, averaging 1334 mm (53 in) of precipitation annually. While rainfall varies throughout the year, each season offers its own charm. December brings wetter days averaging 146 mm (5.7 in) of precipitation, spread over 20 rainy days.
In contrast, the driest month April experiences a drier climate, with about 83 mm (3.3 in) of rainfall spread across 14 rainy days. For more details, please visit our Swansea Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Swansea
Seasonal changes in sunshine hours are quite dramatic in Swansea. While July receives considerable daily sunshine with up to 6.7 hours, December marks the darkest time of the year, where sunshine is scarce with only 1.6 hours of sunlight per day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Humidity in Swansea by Month
The city experiences its highest humidity in January, reaching 89%. In June, the humidity drops to its lowest level at 73%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Swansea
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: July
- Warmest weather: July and August
- Most sunshine: May, June and July
- Seasonal pattern: Pleasant summers and cold winters
Frequently asked questions about the climate in Swansea
What is the best time to visit Swansea?
July typically offers the most optimal weather in Swansea. In contrast, January, February, November and December tend to have less optimal conditions. Swansea has pleasant summers and cold winters.
What temperatures can I expect in Swansea?
Daytime highs range from 9°C (48°F) in January to 20°C (68°F) in August. Nighttime lows range from 4°C (39°F) to 14°C (57°F).
How much rain does Swansea get?
Annual rainfall is around 1334 mm (53 in). December is the wettest month with 146 mm (5.7 in), while April is the driest with 83 mm (3.3 in).
How sunny is Swansea?
Swansea receives around 1,573 hours of sunshine per year. July is the sunniest month with 202 hours, while December is the cloudiest with just 49 hours.
Swansea 3-Day Forecast
Swansea on the map
Swansea is highlighted - select any city to see its climate.
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