Warm
Average highs sit around 30°C, giving warm days by monthly-average standards.
Weather Guide
Ulsan, South Korea Average Monthly Weather
Weather score45Mixed annual avg
Best months: August, September, July
Across the year, average daytime temperatures are around 18°C, sunshine averages 6.3h per day, and rainfall totals about 1261mm. Sea temperatures average 19°C across the year.
Annual weather
Annual averages
Temp
18°C
Rain
1261mm
Annual total
Sun
6.3h
Sea
19°C
Weather score
45
Mixed avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Wet
Rainfall averages 199mm, so showers are a real planning factor.
Some sun
Sunshine averages 6.5h per day, enough for a balanced month.
Swimmable
Sea temperatures average 26°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
August30°C average high
August is one of Ulsan's warmest months, with daytime heat above the yearly average.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
August199mm average rain
August 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
August6.5 hours average sun
August sits close to Ulsan's yearly sunshine average, so it is a middle-of-the-pack month for bright days.
Brightest monthsApril to May
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
August26°C average sea
August is one of Ulsan's warmest sea months, when swimming comfort is usually strongest.
Warmest seaAugust to September
Sea temperatures are usually near 26°C in this stretch, so swimming comfort is at its strongest.
Weather score
August63 weather score
August is one of Ulsan's best weather-score months, combining the strongest overall balance in the yearly averages.
Best weather monthsJune to September
These months have the strongest weather score in the monthly averages.
