Swansea Weather & Climate: Best Time to Visit

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 February.

At night, you can expect temperatures ranging from 14°C (57°F) in August to around 4°C (39°F) during February.

Check out our detailed temperature page for more information.

Temperature ranges by month

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

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

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