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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Recommended for South Korea

  • Kids stay & eat for free at Marriot Bonvoy
  • Destinations include Europe, Middle East & Africa
  • Valid for up to 2 adults & 2 kids aged up to 12

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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