Jeju weather in May 2025

Expect 21°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Jeju in May. Check more long-term weather averages for Jeju in May before you book your next holiday to South Korea in 2025/2026.

  • 21°C maximum daytime temperature in May in Jeju21
    21°C max day temperature
  • 7 hours of sunshine per day
  • 10 days with some rainfall in May in Jeju10
    10 days with some rainfall
  • 13°C minimum night-time temperature in May in Jeju13
    13°C min night temperature
  • 14 hours of daylight per day in May in Jeju14
    14 hours of daylight per day
  • No heat & humidity in May in Jeju0
    No heat & humidity
  • 140 mm monthly rainfall in May in Jeju140
    140 mm of monthly rainfall
  • UV (maximum) index 9 (Very High) in May in Jeju9
    9 (Very High) UV index
  • 16°C sea temperature in May in Jeju16
    16°C sea temperature

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The May weather guide for South Korea (Jeju) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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How hot is it in Jeju in May?

Daytime temperatures usually reach 21°C in Jeju in May, falling to 13°C at night.

How sunny is it in Jeju in May?

There are normally 7 hours of bright sunshine each day in Jeju in May - that's 52% of daylight hours.

How warm is the sea around Jeju in May?

The average sea temperature around Jeju in May is 16°C.

Does it rain in Jeju in May?

There are usually 10 days with some rain in Jeju in May and the average monthly rainfall is 140mm.

Jeju May sunrise & sunset times

Browse the sunrise and sunset times for Jeju in May 2025. Select a month to view Jeju sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st May 2025 05:46 19:17
Friday, 16th May 2025 05:33 19:28
Saturday, 31st May 2025 05:25 19:38

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