Mild
Average highs are around 25°C, so days are mild rather than hot.
September verdict
Incheon, South Korea in September
Weather score60Good
Good for holiday weather
Average highs are around 25°C, so days are mild rather than hot. Sunshine averages 6.9h per day, enough for a balanced month. Rainfall averages 155mm, so some wet days are possible.
September weather
Monthly averages
Temp
25°C
Rain
155mm
Sun
6.9h
Sea
23°C
Weather score
60
Good
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 155mm, so some wet days are possible.
Some sun
Sunshine averages 6.9h per day, enough for a balanced month.
Swimmable
Sea temperatures average 23°C, which can work for swimming but may feel fresh.
Map
Weather map
Compare Incheon, 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
September155mm average rain
September sits near Incheon's yearly rainfall average, so rain is a normal planning factor rather than an outlier.
Driest monthsJanuary to May and October to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September6.9 hours average sun
September sits close to Incheon's yearly sunshine average, so it is a middle-of-the-pack month for bright days.
Brightest monthsApril to June
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
September23°C average sea
September is one of Incheon's warmest sea months, when swimming comfort is usually strongest.
Warmest seaJuly to October
Sea temperatures are usually near 21°C in this stretch, so swimming comfort is at its strongest.
Weather score
September60 weather score
September is one of Incheon's best weather-score months, combining the strongest overall balance in the yearly averages.
Best weather monthsJune and August to September
These months have the strongest weather score in the monthly averages.
