Cool
Average highs are around 17°C, so pack for cooler days.
September verdict
Swansea, Wales, United Kingdom in September
Weather score32Poor
Poor for holiday weather
Average highs are around 17°C, so pack for cooler days. Sunshine averages 4.5h per day, so this is not one of the brighter months. Rainfall averages 111mm, so some wet days are possible.
September weather
Monthly averages
Temp
17°C
Rain
111mm
Sun
4.5h
Sea
17°C
Weather score
32
Poor
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 111mm, so some wet days are possible.
Limited sun
Sunshine averages 4.5h per day, so this is not one of the brighter months.
Cool sea
Sea temperatures average 17°C, so the water can feel cool.
Map
Weather map
Compare Swansea, Wales, United Kingdom with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September17°C average high
September sits in the warmer part of the year, so midday sightseeing can feel heavier than in cooler months.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
September111mm average rain
September sits near Swansea's yearly rainfall average, so rain is a normal planning factor rather than an outlier.
Driest monthsFebruary to July
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September4.5 hours average sun
September sits close to Swansea's yearly sunshine average, so it is a middle-of-the-pack month for bright days.
Brightest monthsApril to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
September17°C average sea
September is one of Swansea's warmest sea months, when swimming comfort is usually strongest.
Warmest seaJuly to September
Sea temperatures are usually near 16°C in this stretch, so swimming comfort is at its strongest.
Weather score
September32 weather score
September sits close to Swansea's yearly weather-score average, giving a typical overall read on the month.
Best weather monthsJune to August
These months have the strongest weather score in the monthly averages.
