yearsofweather

Busan in September:
comfortably warm, occasional rain

Busan, South Korea · Records from 2006 to 2025. Not a forecast.

Mean high27°Hottest day 33.6° (2024)
Mean low20°Coldest night 11° (2017)
Rain days8 days3-13 by year
Rainfall176mmDaylight 12.9 → 11.9 h
Busan's 12 months iBest: May, June and October
Trip types Beach Finewarm sea and storm riskSightseeing on foot Finemild and storm risk
Humidity76%12 muggy days
Clear days5 days11 overcast days
Mean wind12 km/hRarely windy
Sea temperature26°24.4-28.1° by year (last 6)
Sunrise / sunset (15th)06:06 / 18:32Daylight 12.9 → 11.9 h

Busan in September

Many of the typhoons that did the worst damage to Busan arrived in September. The sea, on the other hand, stays nearly as warm as in August, and Haeundae has kept its beach open until mid September in recent years. Chuseok, the harvest holiday, follows the lunar calendar and falls in September or early October, when trains to Busan sell out early.

September in Busan was on the warm side, averaging 27°C by day and 20°C at night. With about 8 rain days, showers were an occasional nuisance rather than the rule. Individual years ran between 3 and 13 rain days.

About 3 days a month still climbed past 30°C, the ones where you looked for shade. September 2024 averaged 29.6°C by day, 2.9°C above the 20-year mean. Each rainy day brought about 23 mm, closer to downpours than drizzle.

How long it rained

On a rainy day it rained for about 6.5 hours. Rain came at any time of day.

Typhoons i

9 of the last 20 years had a tropical storm pass within 300 km this month.

  • Hinnamnor (2022), 13 km away typhoon strength
  • Maysak (2020), 40 km away typhoon strength
  • Haishen (2020), 40 km away typhoon strength
1 2 3 4 5 6 47 108 99 410 11 12

Date by date i

‹ August September 2027 October ›
Sun
Mon
Tue
Wed
Thu
Fri
Sat
Week
1-4rain on 40% of days28° 22°
5-11rain on 28% of days28° 21°
12-18rain on 28% of days27° 21°
19-25rain on 17% of days26° 19°
26-30rain on 19% of days25° 18°

0-5/206-8/209-11/2012-20/20

1-4rain on 40% of days28° 22°
5-11rain on 28% of days28° 21°
12-18rain on 28% of days27° 21°
19-25rain on 17% of days26° 19°
26-30rain on 19% of days25° 18°
Tap another date to change

2006none
200717mm
2008none
2009none
201034mm
2011none
2012none
2013none
20145mm
20152mm
2016111mm
2017none
2018none
201980mm
202039mm
20213mm
202238mm
20235mm
20248mm
20255mm
Holidays in September (2027)
  • September 14 to September 16 Chuseok (Korean Thanksgiving) holiday
  • September 14 to September 16 Chuseok break
  • September 6 Labor Day

1 Local public holiday or break (busier, pricier)1 US holidays (flights fill up)

Day by day temperature i

17°23°29°35° 1815222930

Mean high Mean low Coldest to warmest high in 20 years

Your trip dates, the past 20 years

Trip dates ~

You can also click two dates on the axis. Hover a cell to see that day's rain.
Trip rain days Month rain days
2006
2 d 6 d
2007
3 d 13 d
2008
1 d 5 d
2009
0 d 3 d
2010
3 d 8 d
2011
2 d 3 d
2012
3 d 7 d
2013
2 d 4 d
2014
2 d 6 d
2015
2 d 9 d
2016
1 d 9 d
2017
3 d 4 d
2018
1 d 11 d
2019
3 d 13 d
2020
4 d 9 d
2021
2 d 11 d
2022
2 d 7 d
2023
0 d 10 d
2024
1 d 7 d
2025
2 d 8 d
Years with rain
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
9
12
8
3
6
10
8
3
2
4
6
7
3
6
5
6
7
5
2
5
6
3
4
3
1
1
3
5
6
4
Rain days on trip
23103232221313422012

No rain1-9 mm10 mm or more Dates outside your trip are dimmed.

One row per year, one cell per day. 2009 had 3 rain days, 2007 had 13.

Busan through the year

MonthHighLowRain daysRainfallSea
January 8°0°3 days30mm 15°
February 10°2°5 days57mm 14°
March 14°6°7 days91mm 14°
April 18°10°8 days133mm 16°
MayGood 22°15°7 days154mm 17°
JuneGood 25°19°9 days168mm 21°
July 28°22°10 days307mm 24°
August 30°24°9 days222mm 27°
September 27°20°8 days176mm 26°
OctoberGood 23°15°4 days102mm 23°
November 17°8°4 days54mm 20°
December 10°2°4 days36mm 17°

Common questions

Does it rain a lot in Busan in September?

Over the past 20 years September averaged 8 rain days (1 mm or more) out of 30. Individual years ran from 3 in the driest to 13 in the wettest.

What should I wear in Busan in September?

Days averaged 27°C and nights 20°C. Pack a compact umbrella, T-shirts, a light layer for the evenings, sunscreen plus a hat, and a swimsuit.

Can you swim in Busan in September?

Sea surface temperature averaged 26°C in September, comfortable for swimming. Year to year it ranged 24.4-28.1°C. Check local flags for waves and jellyfish on the day.

Is September a good time to visit Busan?

On warmth and rain days alone, Busan's easiest months were May, June and October. September ranked 4 of 12.

Is Busan humid in September?

Mean relative humidity was 76%, with about 12 muggy days (dew point of 20°C or more) in the month.