Cool
Average highs are around 20°C, so pack for cooler days.
May verdict
Jeju-do, South Korea in May
Weather score42Mixed
Mixed for holiday weather
Average highs are around 20°C, so pack for cooler days. Sunshine averages 7h per day, enough for a balanced month. Rainfall averages 155mm, so some wet days are possible.
May weather
Monthly averages
Temp
20°C
Rain
155mm
Sun
7h
Sea
18°C
Weather score
42
Mixed
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 7h per day, enough for a balanced month.
Cool sea
Sea temperatures average 18°C, so the water can feel cool.
Map
Weather map
Compare Jeju-do, South Korea with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
May20°C average high
May is close to Jeju-do's yearly temperature average, giving a typical read on daytime heat.
Warmest monthsJuly to September
This stretch sets the upper range for average daytime heat.
Rain
May155mm average rain
May sits near Jeju-do's yearly rainfall average, so rain is a normal planning factor rather than an outlier.
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
May7 hours average sun
May is brighter than Jeju-do's yearly average, though the strongest sunshine usually sits closer to the peak months.
Brightest monthsMay and August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
May18°C average sea
May is below Jeju-do's yearly sea-temperature average, so swimming can feel fresher.
Warmest seaJuly to September
Sea temperatures are usually near 25°C in this stretch, so swimming comfort is at its strongest.
Weather score
May42 weather score
May sits close to Jeju-do's yearly weather-score average, giving a typical overall read on the month.
Best weather monthsJuly to October
These months have the strongest weather score in the monthly averages.
