The climate throughout the year in Swansea is relatively mild. Winter time highs average in the low to mid 40s. Winter lows average in the upper 30s to low 40s. During the summer, highs average in the low to mid 60s while lows average in the upper 50s to low 60s. The majority of precipitation falls during the winter in Swansea, with the smallest amount of precipitation occuring during the summertime months.

Raininess is a fact of life for most of the year in Wales. In order to plan a less-moist experience, you may want to plan to travel to Swansea during the summertime. Autumn is also a good bet, as the weather is quite mild, and both the Dylan Thomas Festival and Swansea Festival are held during the month of October.