Jeju weather in May 2026

Expect daytime maximum temperatures of 70°F in Jeju, South Korea in May based on long-term weather averages. There are 7 hours of sunshine per day on average with 10 days with some rainfall and typically 5.5 inches of rainfall in the month.

  • 70°F maximum daytime temperature in May in Jeju70
    70°F max day temperature
  • 7 hours of sunshine per day
  • 10 days with some rainfall in May in Jeju10
    10 days with some rainfall
  • 55°F minimum night-time temperature in May in Jeju55
    55°F 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
  • 5.5 inches monthly rainfall in May in Jeju5.5
    5.5 inches of monthly rainfall
  • UV (maximum) index 9 (Very High) in May in Jeju9
    9 (Very High) UV index
  • 61°F sea temperature in May in Jeju61
    61°F 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)  |  Imperial (°F)

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How hot is it in Jeju in May?

Daytime temperatures usually reach 70°F in Jeju in May, falling to 55°F 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 61°F.

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 5.5 inches.

Jeju May sunrise & sunset times

Browse the sunrise and sunset times for Jeju in May 2026. Select a month to view Jeju sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st May 2026 05:46 19:17
Saturday, 16th May 2026 05:33 19:28
Sunday, 31st May 2026 05:25 19:38

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