January 9° · ☂ 8 February 10° · ☂ 8 March 14° · ☂ 8 April 18° · ☂ 8 ★ May22° · ☂ 7 ★ June25° · ☂ 9 July 30° · ☂ 9 August 30° · ☂ 10 September 27° · ☂ 10 ★ October22° · ☂ 6 November 17° · ☂ 8 December 11° · ☂ 9 Jeju in May:warm, occasional rain Jeju, South Korea · Records from 2006 to 2025. Not a forecast.
Mean high 22° Hottest day 27.6° (2007)
Mean low 15° Coldest night 9.2° (2013)
Rain days 7 days 3-13 by year
Rainfall 93mm Daylight 13.5 → 14.2 h
Jeju's 12 months i Best: May, June and October
1 2 3 4 5 6 7 8 9 10 11 12
Trip types Beach Poorcool sea Sightseeing on foot Goodmild
Humidity 76% 1 muggy day
Clear days 7 days 13 overcast days
Mean wind 11 km/h Rarely windy
Sea temperature 16.9° 15.6-18° by year (last 6)
Sunrise / sunset (15th) 05:34 / 19:26 Daylight 13.5 → 14.2 h
Jeju in May May has the most hours of sunshine of the year in Jeju City, which makes it a good month for Hallasan. Only the Seongpanak and Gwaneumsa trails reach the summit crater, and both need a booking in advance; Eorimok and Yeongsil need no booking but stop short of the top. The sea is still too cold for most swimmers.
Highs of 22°C and lows of 15°C: short sleeves by day, with mild nights. 7 rain days in a typical May: noticeable, but most days stayed dry. Most years sat near the average of 7, though 2022 dipped to 3 and 2016 climbed to 13.
How long it rained On a rainy day it rained for about 7.1 hours. Rain came at any time of day.
0 3 6 9 12 15 18 21
Typhoons i Typhoons: June to November
Date by date i Sun
Mon
Tue
Wed
Thu
Fri
Sat
Week
May 1 Saturday 1 rain in 4 of 20 yrs 4/20 20° 13° May 1 rain on 20% of days 20° 13°
May 2 Sunday 2 rain in 5 of 20 yrs 5/20 21° 13° May 3 Monday 3 rain in 4 of 20 yrs 4/20 21° 13° May 4 Tuesday 4 rain in 6 of 20 yrs 6/20 21° 13° May 5 Wednesday 5 rain in 5 of 20 yrs 5/20 21° 14° May 6 Thursday 6 rain in 5 of 20 yrs 5/20 21° 14° May 7 Friday 7 rain in 2 of 20 yrs 2/20 21° 13° May 8 Saturday 8 rain in 1 of 20 yrs 1/20 21° 14° 2-8 rain on 20% of days 21° 14°
May 9 Sunday 9 rain in 7 of 20 yrs 7/20 21° 14° May 10 Monday 10 rain in 5 of 20 yrs 5/20 21° 14° May 11 Tuesday 11 rain in 6 of 20 yrs 6/20 21° 14° May 12 Wednesday 12 rain in 7 of 20 yrs 7/20 21° 14° May 13 Thursday 13 rain in 4 of 20 yrs 4/20 22° 14° May 14 Friday 14 rain in 3 of 20 yrs 3/20 22° 14° May 15 Saturday 15 rain in 4 of 20 yrs 4/20 22° 15° 9-15 rain on 26% of days 21° 14°
May 16 Sunday 16 rain in 7 of 20 yrs 7/20 22° 16° May 17 Monday 17 rain in 4 of 20 yrs 4/20 22° 15° May 18 Tuesday 18 rain in 6 of 20 yrs 6/20 22° 15° May 19 Wednesday 19 rain in 5 of 20 yrs 5/20 22° 15° May 20 Thursday 20 rain in 3 of 20 yrs 3/20 22° 15° May 21 Friday 21 rain in 2 of 20 yrs 2/20 23° 15° May 22 Saturday 22 rain in 5 of 20 yrs 5/20 23° 16° 16-22 rain on 23% of days 23° 15°
May 23 Sunday 23 rain in 5 of 20 yrs 5/20 23° 16° May 24 Monday 24 rain in 4 of 20 yrs 4/20 23° 16° May 25 Tuesday 25 rain in 5 of 20 yrs 5/20 23° 16° May 26 Wednesday 26 rain in 5 of 20 yrs 5/20 24° 17° May 27 Thursday 27 rain in 6 of 20 yrs 6/20 23° 17° May 28 Friday 28 rain in 5 of 20 yrs 5/20 23° 17° May 29 Saturday 29 rain in 3 of 20 yrs 3/20 24° 17° 23-29 rain on 24% of days 23° 17°
May 30 Sunday 30 rain in 2 of 20 yrs 2/20 24° 17° May 31 Monday 31 rain in 3 of 20 yrs 3/20 24° 17°
30-31 rain on 13% of days 24° 17°
May 1 rain on 20% of days 20° 13° 2-8 rain on 20% of days 21° 14° 9-15 rain on 26% of days 21° 14° 16-22 rain on 23% of days 23° 15° 23-29 rain on 24% of days 23° 17° 30-31 rain on 13% of days 24° 17°
Sun
Mon
Tue
Wed
Thu
Fri
Sat
Week
May 1 Monday 1 rain in 4 of 20 yrs 4/20 20° 13° May 2 Tuesday 2 rain in 5 of 20 yrs 5/20 21° 13° May 3 Wednesday 3 rain in 4 of 20 yrs 4/20 21° 13° May 4 Thursday 4 rain in 6 of 20 yrs 6/20 21° 13° May 5 Friday 5 rain in 5 of 20 yrs 5/20 21° 14° May 6 Saturday 6 rain in 5 of 20 yrs 5/20 21° 14° 1-6 rain on 24% of days 21° 13°
May 7 Sunday 7 rain in 2 of 20 yrs 2/20 21° 13° May 8 Monday 8 rain in 1 of 20 yrs 1/20 21° 14° May 9 Tuesday 9 rain in 7 of 20 yrs 7/20 21° 14° May 10 Wednesday 10 rain in 5 of 20 yrs 5/20 21° 14° May 11 Thursday 11 rain in 6 of 20 yrs 6/20 21° 14° May 12 Friday 12 rain in 7 of 20 yrs 7/20 21° 14° May 13 Saturday 13 rain in 4 of 20 yrs 4/20 22° 14° 7-13 rain on 23% of days 21° 14°
May 14 Sunday 14 rain in 3 of 20 yrs 3/20 22° 14° May 15 Monday 15 rain in 4 of 20 yrs 4/20 22° 15° May 16 Tuesday 16 rain in 7 of 20 yrs 7/20 22° 16° May 17 Wednesday 17 rain in 4 of 20 yrs 4/20 22° 15° May 18 Thursday 18 rain in 6 of 20 yrs 6/20 22° 15° May 19 Friday 19 rain in 5 of 20 yrs 5/20 22° 15° May 20 Saturday 20 rain in 3 of 20 yrs 3/20 22° 15° 14-20 rain on 23% of days 22° 15°
May 21 Sunday 21 rain in 2 of 20 yrs 2/20 23° 15° May 22 Monday 22 rain in 5 of 20 yrs 5/20 23° 16° May 23 Tuesday 23 rain in 5 of 20 yrs 5/20 23° 16° May 24 Wednesday 24 rain in 4 of 20 yrs 4/20 23° 16° May 25 Thursday 25 rain in 5 of 20 yrs 5/20 23° 16° May 26 Friday 26 rain in 5 of 20 yrs 5/20 24° 17° May 27 Saturday 27 rain in 6 of 20 yrs 6/20 23° 17° 21-27 rain on 23% of days 23° 16°
May 28 Sunday 28 rain in 5 of 20 yrs 5/20 23° 17° May 29 Monday 29 rain in 3 of 20 yrs 3/20 24° 17° May 30 Tuesday 30 rain in 2 of 20 yrs 2/20 24° 17° May 31 Wednesday 31 rain in 3 of 20 yrs 3/20 24° 17°
28-31 rain on 16% of days 24° 17°
1-6 rain on 24% of days 21° 13° 7-13 rain on 23% of days 21° 14° 14-20 rain on 23% of days 22° 15° 21-27 rain on 23% of days 23° 16° 28-31 rain on 16% of days 24° 17°
Tap another date to change
2006 9mm
2007 2mm
2008 none
2009 none
2010 none
2011 10mm
2012 none
2013 9mm
2014 none
2015 none
2016 none
2017 9mm
2018 none
2019 none
2020 20mm
2021 none
2022 none
2023 none
2024 none
2025 57mm
Holidays in May (2027) May 1 Labour DayMay 5 Children's DayMay 13 Buddha's BirthdayMay 31 Memorial Day 1 Local public holiday or break (busier, pricier)1 US holidays (flights fill up)
Day by day temperature i 12° 18° 23° 29° 1 8 15 22 29 31
Your trip dates, the past 20 years Trip dates May 1 (Sat) 2 (Sun) 3 (Mon) 4 (Tue) 5 (Wed) 6 (Thu) 7 (Fri) 8 (Sat) 9 (Sun) 10 (Mon) 11 (Tue) 12 (Wed) 13 (Thu) 14 (Fri) 15 (Sat) 16 (Sun) 17 (Mon) 18 (Tue) 19 (Wed) 20 (Thu) 21 (Fri) 22 (Sat) 23 (Sun) 24 (Mon) 25 (Tue) 26 (Wed) 27 (Thu) 28 (Fri) 29 (Sat) 30 (Sun) 31 (Mon) ~ May 1 (Sat) 2 (Sun) 3 (Mon) 4 (Tue) 5 (Wed) 6 (Thu) 7 (Fri) 8 (Sat) 9 (Sun) 10 (Mon) 11 (Tue) 12 (Wed) 13 (Thu) 14 (Fri) 15 (Sat) 16 (Sun) 17 (Mon) 18 (Tue) 19 (Wed) 20 (Thu) 21 (Fri) 22 (Sat) 23 (Sun) 24 (Mon) 25 (Tue) 26 (Wed) 27 (Thu) 28 (Fri) 29 (Sat) 30 (Sun) 31 (Mon) 1-7 8-14 15-21 22-end Whole month
You can also click two dates on the axis. Hover a cell to see that day's rain. By year Driest trips first
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Trip rain days Month rain days Tap a date to start, tap another to end. Each cell is that date in one year. '06 '07 '08 '09 '10 '11 '12 '13 '14 '15 '16 '17 '18 '19 '20 '21 '22 '23 '24 '25
of 20 Dates outside your trip are dimmed.
One row per year, one cell per day. 2022 had 3 rain days, 2016 had 13.
Jeju through the year Month High Low Rain days Rainfall Sea January 9° 4° 8 days 59mm 16° February 10° 4° 8 days 67mm 15° March 14° 7° 8 days 85mm 14° April 18° 11° 8 days 89mm 15° May Good 22° 15° 7 days 93mm 17° June Good 25° 19° 9 days 161mm 21° July 30° 24° 9 days 201mm 25° August 30° 25° 10 days 254mm 28° September 27° 21° 10 days 290mm 27° October Good 22° 16° 6 days 107mm 23° November 17° 11° 8 days 90mm 20° December 11° 6° 9 days 54mm 17°
Common questions Does it rain a lot in Jeju in May? Over the past 20 years May averaged 7 rain days (1 mm or more) out of 31. Individual years ran from 3 in the driest to 13 in the wettest.
What should I wear in Jeju in May? Days averaged 22°C and nights 15°C. Pack a compact umbrella, a light layer for the evenings, and T-shirts.
Can you swim in Jeju in May? Sea surface temperature averaged 16.9°C in May, too cold for most people without a wetsuit. Year to year it ranged 15.6-18°C. Check local flags for waves and jellyfish on the day.
Is May a good time to visit Jeju? On warmth and rain days alone, Jeju's easiest months were May, June and October. May ranked 2 of 12, close to the top.
How many clear days does Jeju get in May? About 7 clear days (under 30% cloud on average) and 13 overcast days (80% or more).
Previous month Jeju in April Next month Jeju in June Whole year Jeju weather by month Where to go May By country South Korea: all cities this month Compare Compare with Busan Compare Compare with Naha