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 August:properly hot, frequent rain Jeju, South Korea · Records from 2006 to 2025. Not a forecast.
Mean high 30° Hottest day 34.8° (2013)
Mean low 25° Coldest night 20.3° (2016)
Rain days 10 days 4-16 by year
Rainfall 254mm Daylight 13.8 → 12.9 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 Finehot, muggy and storm risk
Humidity 83% 30 muggy days
Clear days 6 days 11 overcast days
Mean wind 12 km/h 1 windy day
Sea temperature 28.2° 26.5-29.9° by year (last 6)
Sunrise / sunset (15th) 05:56 / 19:21 Daylight 13.8 → 12.9 h
Jeju in August Typhoons affect Korea most often in August. Even without a direct hit, Jeju gets gales and heavy swell, and flights and ferries can be cancelled. Along with September, it has the most rainy days of the year. On clear days the sea is warm and swimming is at its best.
August brought serious heat to Jeju, 30°C on a typical afternoon and 25°C overnight. Early mornings were the best time to be outside. There were 10 rain days on average, roughly one day in three. Year to year it swung widely, from 4 rain days in 2016 to 16 in 2014.
18 days past 30°C made it a month for early starts and a long lunch indoors. Rain days averaged 26 mm each, so when it rained it rained properly.
How long it rained On a rainy day it rained for about 5.7 hours. Rain came at any time of day.
0 3 6 9 12 15 18 21
Typhoons i 10 of the last 20 years had a tropical storm pass within 300 km this month.
Dianmu (2010), 33 km away tropical storm Tembin (2012), 49 km away tropical storm Soulik (2018), 80 km away typhoon strength 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
August 1 Sunday 1 rain in 3 of 20 yrs 3/20 31° 26° August 2 Monday 2 rain in 5 of 20 yrs 5/20 31° 26° August 3 Tuesday 3 rain in 5 of 20 yrs 5/20 31° 26° August 4 Wednesday 4 rain in 4 of 20 yrs 4/20 31° 26° August 5 Thursday 5 rain in 6 of 20 yrs 6/20 31° 26° August 6 Friday 6 rain in 5 of 20 yrs 5/20 31° 26° August 7 Saturday 7 rain in 3 of 20 yrs 3/20 31° 26° 1-7 rain on 22% of days 31° 26°
August 8 Sunday 8 rain in 6 of 20 yrs 6/20 31° 26° August 9 Monday 9 rain in 5 of 20 yrs 5/20 31° 25° August 10 Tuesday 10 rain in 9 of 20 yrs 9/20 30° 25° August 11 Wednesday 11 rain in 11 of 20 yrs 11/20 30° 25° August 12 Thursday 12 rain in 7 of 20 yrs 7/20 31° 25° August 13 Friday 13 rain in 4 of 20 yrs 4/20 30° 25° August 14 Saturday 14 rain in 7 of 20 yrs 7/20 30° 25° 8-14 rain on 35% of days 30° 25°
August 15 Sunday 15 rain in 6 of 20 yrs 6/20 31° 25° August 16 Monday 16 rain in 5 of 20 yrs 5/20 30° 25° August 17 Tuesday 17 rain in 8 of 20 yrs 8/20 31° 25° August 18 Wednesday 18 rain in 3 of 20 yrs 3/20 30° 25° August 19 Thursday 19 rain in 2 of 20 yrs 2/20 31° 25° August 20 Friday 20 rain in 6 of 20 yrs 6/20 31° 25° August 21 Saturday 21 rain in 7 of 20 yrs 7/20 30° 25° 15-21 rain on 26% of days 30° 25°
August 22 Sunday 22 rain in 10 of 20 yrs 10/20 30° 25° August 23 Monday 23 rain in 7 of 20 yrs 7/20 30° 25° August 24 Tuesday 24 rain in 7 of 20 yrs 7/20 30° 25° August 25 Wednesday 25 rain in 10 of 20 yrs 10/20 30° 24° August 26 Thursday 26 rain in 5 of 20 yrs 5/20 29° 24° August 27 Friday 27 rain in 9 of 20 yrs 9/20 29° 24° August 28 Saturday 28 rain in 9 of 20 yrs 9/20 29° 24° 22-28 rain on 41% of days 30° 24°
August 29 Sunday 29 rain in 8 of 20 yrs 8/20 29° 24° August 30 Monday 30 rain in 7 of 20 yrs 7/20 29° 24° August 31 Tuesday 31 rain in 7 of 20 yrs 7/20 29° 23°
29-31 rain on 37% of days 29° 24°
1-7 rain on 22% of days 31° 26° 8-14 rain on 35% of days 30° 25° 15-21 rain on 26% of days 30° 25° 22-28 rain on 41% of days 30° 24° 29-31 rain on 37% of days 29° 24°
Sun
Mon
Tue
Wed
Thu
Fri
Sat
Week
August 1 Tuesday 1 rain in 3 of 20 yrs 3/20 31° 26° August 2 Wednesday 2 rain in 5 of 20 yrs 5/20 31° 26° August 3 Thursday 3 rain in 5 of 20 yrs 5/20 31° 26° August 4 Friday 4 rain in 4 of 20 yrs 4/20 31° 26° August 5 Saturday 5 rain in 6 of 20 yrs 6/20 31° 26° 1-5 rain on 23% of days 31° 26°
August 6 Sunday 6 rain in 5 of 20 yrs 5/20 31° 26° August 7 Monday 7 rain in 3 of 20 yrs 3/20 31° 26° August 8 Tuesday 8 rain in 6 of 20 yrs 6/20 31° 26° August 9 Wednesday 9 rain in 5 of 20 yrs 5/20 31° 25° August 10 Thursday 10 rain in 9 of 20 yrs 9/20 30° 25° August 11 Friday 11 rain in 11 of 20 yrs 11/20 30° 25° August 12 Saturday 12 rain in 7 of 20 yrs 7/20 31° 25° 6-12 rain on 33% of days 31° 25°
August 13 Sunday 13 rain in 4 of 20 yrs 4/20 30° 25° August 14 Monday 14 rain in 7 of 20 yrs 7/20 30° 25° August 15 Tuesday 15 rain in 6 of 20 yrs 6/20 31° 25° August 16 Wednesday 16 rain in 5 of 20 yrs 5/20 30° 25° August 17 Thursday 17 rain in 8 of 20 yrs 8/20 31° 25° August 18 Friday 18 rain in 3 of 20 yrs 3/20 30° 25° August 19 Saturday 19 rain in 2 of 20 yrs 2/20 31° 25° 13-19 rain on 25% of days 30° 25°
August 20 Sunday 20 rain in 6 of 20 yrs 6/20 31° 25° August 21 Monday 21 rain in 7 of 20 yrs 7/20 30° 25° August 22 Tuesday 22 rain in 10 of 20 yrs 10/20 30° 25° August 23 Wednesday 23 rain in 7 of 20 yrs 7/20 30° 25° August 24 Thursday 24 rain in 7 of 20 yrs 7/20 30° 25° August 25 Friday 25 rain in 10 of 20 yrs 10/20 30° 24° August 26 Saturday 26 rain in 5 of 20 yrs 5/20 29° 24° 20-26 rain on 37% of days 30° 25°
August 27 Sunday 27 rain in 9 of 20 yrs 9/20 29° 24° August 28 Monday 28 rain in 9 of 20 yrs 9/20 29° 24° August 29 Tuesday 29 rain in 8 of 20 yrs 8/20 29° 24° August 30 Wednesday 30 rain in 7 of 20 yrs 7/20 29° 24° August 31 Thursday 31 rain in 7 of 20 yrs 7/20 29° 23°
27-31 rain on 40% of days 29° 24°
1-5 rain on 23% of days 31° 26° 6-12 rain on 33% of days 31° 25° 13-19 rain on 25% of days 30° 25° 20-26 rain on 37% of days 30° 25° 27-31 rain on 40% of days 29° 24°
Tap another date to change
2006 3mm
2007 35mm
2008 23mm
2009 43mm
2010 17mm
2011 none
2012 5mm
2013 none
2014 none
2015 21mm
2016 none
2017 none
2018 none
2019 34mm
2020 11mm
2021 49mm
2022 none
2023 none
2024 none
2025 27mm
Holidays in August (2027) August 14 to August 16 Liberation Day long weekendAugust 16 Substitute holiday (Liberation Day) 1 Local public holiday or break (busier, pricier)
Day by day temperature i 22° 27° 31° 36° 1 8 15 22 29 31
Your trip dates, the past 20 years Trip dates August 1 (Sun) 2 (Mon) 3 (Tue) 4 (Wed) 5 (Thu) 6 (Fri) 7 (Sat) 8 (Sun) 9 (Mon) 10 (Tue) 11 (Wed) 12 (Thu) 13 (Fri) 14 (Sat) 15 (Sun) 16 (Mon) 17 (Tue) 18 (Wed) 19 (Thu) 20 (Fri) 21 (Sat) 22 (Sun) 23 (Mon) 24 (Tue) 25 (Wed) 26 (Thu) 27 (Fri) 28 (Sat) 29 (Sun) 30 (Mon) 31 (Tue) ~ August 1 (Sun) 2 (Mon) 3 (Tue) 4 (Wed) 5 (Thu) 6 (Fri) 7 (Sat) 8 (Sun) 9 (Mon) 10 (Tue) 11 (Wed) 12 (Thu) 13 (Fri) 14 (Sat) 15 (Sun) 16 (Mon) 17 (Tue) 18 (Wed) 19 (Thu) 20 (Fri) 21 (Sat) 22 (Sun) 23 (Mon) 24 (Tue) 25 (Wed) 26 (Thu) 27 (Fri) 28 (Sat) 29 (Sun) 30 (Mon) 31 (Tue) 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. 2016 had 4 rain days, 2014 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 Loose, light-colored clothes, sandals and a hat did most of the work at 30°C. Sights went in the morning, with a break in the middle of the day.
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 August? Over the past 20 years August averaged 10 rain days (1 mm or more) out of 31. Individual years ran from 4 in the driest to 16 in the wettest.
What should I wear in Jeju in August? Days averaged 30°C and nights 25°C. Pack a compact umbrella, T-shirts, sunscreen plus a hat, a swimsuit, and insect repellent.
Can you swim in Jeju in August? Sea surface temperature averaged 28.2°C in August, warm enough to stay in for a long swim. Year to year it ranged 26.5-29.9°C. Check local flags for waves and jellyfish on the day.
Is August a good time to visit Jeju? On warmth and rain days alone, Jeju's easiest months were May, June and October. August ranked 8 of 12.
Is Jeju humid in August? Mean relative humidity was 83%, with about 30 muggy days (dew point of 20°C or more) in the month.
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