Warm
Average highs sit around 30°C, giving warm days by monthly-average standards.
Weather Guide
Ulleungdo, South Korea Average Monthly Weather
Weather score43Mixed annual avg
Best months: August, September, June
Across the year, average daytime temperatures are around 22°C, sunshine averages 0h per day, and rainfall totals about 1185mm. Sea temperatures average 17°C across the year.
Annual weather
Annual averages
Temp
22°C
Rain
1185mm
Annual total
Sun
0h
Sea
17°C
Weather score
43
Mixed avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 172mm, so some wet days are possible.
Limited sun
Sunshine averages 0h per day, so this is not one of the brighter months.
Swimmable
Sea temperatures average 25°C, which can work for swimming but may feel fresh.
Map
Weather map
Compare Ulleungdo, South Korea with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
August30°C average high
August is one of Ulleungdo's warmest months, with daytime heat above the yearly average.
Warmest monthsJuly to September
This stretch sets the upper range for average daytime heat.
Rain
August172mm average rain
August is wetter than Ulleungdo's yearly average, so flexible plans matter more.
Driest monthsJanuary to June and October to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
August0 hours average sun
August is close to Ulleungdo's usual sunshine level, with limited seasonal swing across the year.
Brightest monthsAll year
Sunshine stays consistently strong through the year.
Sea temperature
August25°C average sea
August is one of Ulleungdo's warmest sea months, when swimming comfort is usually strongest.
Warmest seaJuly to September
Sea temperatures are usually near 22°C in this stretch, so swimming comfort is at its strongest.
Weather score
August66 weather score
August is one of Ulleungdo'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.