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 September:warm, frequent rain Jeju, South Korea · Records from 2006 to 2025. Not a forecast.
Mean high 27° Hottest day 32.2° (2024)
Mean low 21° Coldest night 15.1° (2008)
Rain days 10 days 4-16 by year
Rainfall 290mm Daylight 12.9 → 11.9 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 Finewarm sea and storm risk Sightseeing on foot Finemild, muggy and storm risk
Humidity 80% 18 muggy days
Clear days 5 days 10 overcast days
Mean wind 12 km/h 1 windy day
Sea temperature 26.7° 24.1-29° by year (last 6)
Sunrise / sunset (15th) 06:17 / 18:41 Daylight 12.9 → 11.9 h
Jeju in September Typhoon risk is not over yet. The beaches usually close at the end of August, though in some years they stay open into early September. Chuseok, the Korean harvest holiday, follows the lunar calendar and falls in September or early October, and flights between Seoul and Jeju sell out around it. Midday heat eases toward the end of the month.
Highs of 27°C and lows of 21°C: short sleeves by day, with warm nights. Rain fell on 10 days of the month on average. The average is 10, but individual years ran from 4 (2011) to 16 (2019).
Highs passed 30°C on 2 days on average. Not every year was typical: 2024 ran 3.2°C warmer than the mean, with highs of 29.7°C. Rain days averaged 29 mm each, so when it rained it rained properly.
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 8 of the last 20 years had a tropical storm pass within 300 km this month.
Nari (2007), 51 km away typhoon strength Hinnamnor (2022), 75 km away typhoon strength Malou (2010), 98 km away tropical storm 1 2 3 4 5 1 6 7 7 10 8 8 9 4 10 1 11 12
Date by date i Sun
Mon
Tue
Wed
Thu
Fri
Sat
Week
September 1 Wednesday 1 rain in 10 of 20 yrs 10/20 28° 23° September 2 Thursday 2 rain in 11 of 20 yrs 11/20 27° 23° September 3 Friday 3 rain in 7 of 20 yrs 7/20 28° 23° September 4 Saturday 4 rain in 5 of 20 yrs 5/20 28° 23° 1-4 rain on 41% of days 28° 23°
September 5 Sunday 5 rain in 10 of 20 yrs 10/20 27° 22° September 6 Monday 6 rain in 10 of 20 yrs 10/20 27° 23° September 7 Tuesday 7 rain in 8 of 20 yrs 8/20 27° 22° September 8 Wednesday 8 rain in 4 of 20 yrs 4/20 27° 22° September 9 Thursday 9 rain in 3 of 20 yrs 3/20 27° 22° September 10 Friday 10 rain in 5 of 20 yrs 5/20 27° 22° September 11 Saturday 11 rain in 5 of 20 yrs 5/20 27° 22° 5-11 rain on 32% of days 27° 22°
September 12 Sunday 12 rain in 9 of 20 yrs 9/20 27° 22° September 13 Monday 13 rain in 8 of 20 yrs 8/20 27° 22° September 14 Tuesday 14 rain in 10 of 20 yrs 10/20 27° 22° September 15 Wednesday 15 rain in 11 of 20 yrs 11/20 27° 22° September 16 Thursday 16 rain in 10 of 20 yrs 10/20 27° 22° September 17 Friday 17 rain in 11 of 20 yrs 11/20 27° 22° September 18 Saturday 18 rain in 5 of 20 yrs 5/20 27° 21° 12-18 rain on 46% of days 27° 22°
September 19 Sunday 19 rain in 4 of 20 yrs 4/20 26° 21° September 20 Monday 20 rain in 7 of 20 yrs 7/20 26° 21° September 21 Tuesday 21 rain in 6 of 20 yrs 6/20 26° 21° September 22 Wednesday 22 rain in 5 of 20 yrs 5/20 26° 20° September 23 Thursday 23 rain in 5 of 20 yrs 5/20 25° 20° September 24 Friday 24 rain in 2 of 20 yrs 2/20 26° 20° September 25 Saturday 25 rain in 1 of 20 yrs 1/20 26° 20° 19-25 rain on 21% of days 26° 21°
September 26 Sunday 26 rain in 2 of 20 yrs 2/20 26° 21° September 27 Monday 27 rain in 4 of 20 yrs 4/20 26° 20° September 28 Tuesday 28 rain in 5 of 20 yrs 5/20 26° 21° September 29 Wednesday 29 rain in 6 of 20 yrs 6/20 25° 20° September 30 Thursday 30 rain in 11 of 20 yrs 11/20 24° 20°
26-30 rain on 28% of days 25° 20°
1-4 rain on 41% of days 28° 23° 5-11 rain on 32% of days 27° 22° 12-18 rain on 46% of days 27° 22° 19-25 rain on 21% of days 26° 21° 26-30 rain on 28% of days 25° 20°
Sun
Mon
Tue
Wed
Thu
Fri
Sat
Week
September 1 Friday 1 rain in 10 of 20 yrs 10/20 28° 23° September 2 Saturday 2 rain in 11 of 20 yrs 11/20 27° 23° 1-2 rain on 53% of days 27° 23°
September 3 Sunday 3 rain in 7 of 20 yrs 7/20 28° 23° September 4 Monday 4 rain in 5 of 20 yrs 5/20 28° 23° September 5 Tuesday 5 rain in 10 of 20 yrs 10/20 27° 22° September 6 Wednesday 6 rain in 10 of 20 yrs 10/20 27° 23° September 7 Thursday 7 rain in 8 of 20 yrs 8/20 27° 22° September 8 Friday 8 rain in 4 of 20 yrs 4/20 27° 22° September 9 Saturday 9 rain in 3 of 20 yrs 3/20 27° 22° 3-9 rain on 34% of days 27° 22°
September 10 Sunday 10 rain in 5 of 20 yrs 5/20 27° 22° September 11 Monday 11 rain in 5 of 20 yrs 5/20 27° 22° September 12 Tuesday 12 rain in 9 of 20 yrs 9/20 27° 22° September 13 Wednesday 13 rain in 8 of 20 yrs 8/20 27° 22° September 14 Thursday 14 rain in 10 of 20 yrs 10/20 27° 22° September 15 Friday 15 rain in 11 of 20 yrs 11/20 27° 22° September 16 Saturday 16 rain in 10 of 20 yrs 10/20 27° 22° 10-16 rain on 41% of days 27° 22°
September 17 Sunday 17 rain in 11 of 20 yrs 11/20 27° 22° September 18 Monday 18 rain in 5 of 20 yrs 5/20 27° 21° September 19 Tuesday 19 rain in 4 of 20 yrs 4/20 26° 21° September 20 Wednesday 20 rain in 7 of 20 yrs 7/20 26° 21° September 21 Thursday 21 rain in 6 of 20 yrs 6/20 26° 21° September 22 Friday 22 rain in 5 of 20 yrs 5/20 26° 20° September 23 Saturday 23 rain in 5 of 20 yrs 5/20 25° 20° 17-23 rain on 31% of days 26° 21°
September 24 Sunday 24 rain in 2 of 20 yrs 2/20 26° 20° September 25 Monday 25 rain in 1 of 20 yrs 1/20 26° 20° September 26 Tuesday 26 rain in 2 of 20 yrs 2/20 26° 21° September 27 Wednesday 27 rain in 4 of 20 yrs 4/20 26° 20° September 28 Thursday 28 rain in 5 of 20 yrs 5/20 26° 21° September 29 Friday 29 rain in 6 of 20 yrs 6/20 25° 20° September 30 Saturday 30 rain in 11 of 20 yrs 11/20 24° 20° 24-30 rain on 22% of days 25° 20°
1-2 rain on 53% of days 27° 23° 3-9 rain on 34% of days 27° 22° 10-16 rain on 41% of days 27° 22° 17-23 rain on 31% of days 26° 21° 24-30 rain on 22% of days 25° 20°
Tap another date to change
2006 10mm
2007 none
2008 none
2009 none
2010 20mm
2011 none
2012 none
2013 none
2014 14mm
2015 none
2016 55mm
2017 none
2018 7mm
2019 15mm
2020 402mm
2021 20mm
2022 152mm
2023 93mm
2024 none
2025 3mm
Holidays in September (2027) September 14 to September 16 Chuseok (Korean Thanksgiving) holidaySeptember 14 to September 16 Chuseok breakSeptember 6 Labor Day 1 Local public holiday or break (busier, pricier)1 US holidays (flights fill up)
Day by day temperature i 19° 24° 29° 34° 1 8 15 22 29 30
Your trip dates, the past 20 years Trip dates September 1 (Wed) 2 (Thu) 3 (Fri) 4 (Sat) 5 (Sun) 6 (Mon) 7 (Tue) 8 (Wed) 9 (Thu) 10 (Fri) 11 (Sat) 12 (Sun) 13 (Mon) 14 (Tue) 15 (Wed) 16 (Thu) 17 (Fri) 18 (Sat) 19 (Sun) 20 (Mon) 21 (Tue) 22 (Wed) 23 (Thu) 24 (Fri) 25 (Sat) 26 (Sun) 27 (Mon) 28 (Tue) 29 (Wed) 30 (Thu) ~ September 1 (Wed) 2 (Thu) 3 (Fri) 4 (Sat) 5 (Sun) 6 (Mon) 7 (Tue) 8 (Wed) 9 (Thu) 10 (Fri) 11 (Sat) 12 (Sun) 13 (Mon) 14 (Tue) 15 (Wed) 16 (Thu) 17 (Fri) 18 (Sat) 19 (Sun) 20 (Mon) 21 (Tue) 22 (Wed) 23 (Thu) 24 (Fri) 25 (Sat) 26 (Sun) 27 (Mon) 28 (Tue) 29 (Wed) 30 (Thu) 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
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 1 Wed Pick September 1
10 2 Thu Pick September 2
11 5 Sun Pick September 5
10 6 Mon Pick September 6
10 10 Fri Pick September 10
5 11 Sat Pick September 11
5 12 Sun Pick September 12
9 13 Mon Pick September 13
8 14 Tue Pick September 14
10 15 Wed Pick September 15
11 16 Thu Pick September 16
10 17 Fri Pick September 17
11 18 Sat Pick September 18
5 19 Sun Pick September 19
4 20 Mon Pick September 20
7 21 Tue Pick September 21
6 22 Wed Pick September 22
5 23 Thu Pick September 23
5 24 Fri Pick September 24
2 25 Sat Pick September 25
1 26 Sun Pick September 26
2 27 Mon Pick September 27
4 28 Tue Pick September 28
5 29 Wed Pick September 29
6 30 Thu Pick September 30
11 Dates outside your trip are dimmed.
One row per year, one cell per day. 2011 had 4 rain days, 2019 had 16.
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°
What to pack With highs of 27°C, breathable clothes work best. Nights at 21°C need only a thin top layer.
Rainy days were mixed in often enough that shoes you cannot get wet are a bad bet.
Common questions Does it rain a lot in Jeju in September? Over the past 20 years September averaged 10 rain days (1 mm or more) out of 30. Individual years ran from 4 in the driest to 16 in the wettest.
What should I wear in Jeju in September? Days averaged 27°C and nights 21°C. Pack a compact umbrella, T-shirts, sunscreen plus a hat, a swimsuit, and insect repellent.
Can you swim in Jeju in September? Sea surface temperature averaged 26.7°C in September, comfortable for swimming. Year to year it ranged 24.1-29°C. Check local flags for waves and jellyfish on the day.
Is September a good time to visit Jeju? On warmth and rain days alone, Jeju's easiest months were May, June and October. September ranked 4 of 12.
Is Jeju humid in September? Mean relative humidity was 80%, with about 18 muggy days (dew point of 20°C or more) in the month.
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