Swansea weather in September
Long-run climate averages for Swansea, Wales in September, plus what the forecast models say for the days ahead.
In September, Swansea averages 18°C by day and 13°C at night. The wettest month is usually March.
September in Swansea averages a daytime high of 18°C and an overnight low of 13°C, which reads as mild for this part of the world. Across the whole year Swansea sees roughly 1786 mm of precipitation.
Climate averages tell you what to pack. They do not tell you what next Tuesday looks like — for that, see the live Swansea forecast with every model compared and how much they currently agree.
Swansea weather by month
what to expect in Swansea through the yearHere is Swansea's typical weather in each month: the average daytime high and overnight low in °C, how each month feels, and the wettest month marked. Use it to plan any trip to Swansea by season.