Mild
Average highs are around 25°C, so days are mild rather than hot.
September verdict
Ulsan, South Korea in September
Weather score59Good
Good for holiday weather
Average highs are around 25°C, so days are mild rather than hot. Sunshine averages 5.6h per day, enough for a balanced month. Rainfall averages 170mm, so some wet days are possible.
September weather
Monthly averages
Temp
25°C
Rain
170mm
Sun
5.6h
Sea
25°C
Weather score
59
Good
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 170mm, so some wet days are possible.
Some sun
Sunshine averages 5.6h per day, enough for a balanced month.
Swimmable
Sea temperatures average 25°C, which can work for swimming but may feel fresh.
Map
Weather map
Compare Ulsan, South Korea with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September25°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
September170mm average rain
September is wetter than Ulsan's yearly average, so flexible plans matter more.
Driest monthsJanuary to March and October to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September5.6 hours average sun
September is one of Ulsan's cloudier months, so sunshine-led plans are less reliable.
Brightest monthsApril to May
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
September25°C average sea
September sits in the warmer sea-temperature season, usually making swimming easier to enjoy.
Warmest seaAugust to September
Sea temperatures are usually near 26°C in this stretch, so swimming comfort is at its strongest.
Weather score
September59 weather score
September scores above Ulsan's yearly average, so the overall weather mix is stronger than most months.
Best weather monthsJune to September
These months have the strongest weather score in the monthly averages.
