Where to Go for Great Weather
South Korea · Month guide

South Korea in September

Around 25 °C with 184 mm of rain and 4.8 hours of sun a day.

September is a mixed month for South Korea — worth planning around specific regions. Around 25 °C with 184 mm of rain and 4.8 hours of sun a day. Use the regional grid below to find where this month works best — national averages hide the swings between coast, highlands, and inland.

Plan a trip in September← South Korea year-round
Match verdictMatch: Acceptable. South Korea · September.
Acceptable
South Korea · September
What the weather usually does

South Korea · typical month

  • Day / night
    18 – 25 °C
    Year range -5 – 30 °C
  • Rainfall
    184 mm
    Year range 31 – 251 mm
  • Sunshine
    4.8 hr / day
    Year range 4.5 – 7.2 hr / day
Compare with another destination
What’s open · September

Things to do in South Korea in September

Nothing in South Korea shuts for the season; September runs the full list.

Opening seasons are checked by hand against the operators and parks themselves, not derived from the climate figures on this page. Last reviewed 2026-08-28. Dates move — confirm before you book.

17 regions · current month

South Korea, taken apart

Safety · 6 governments

What the governments say about South Korea

Combined advisory · most-cautious-wins
Exercise normal precautions
Highest level across 6 governments · Advisory last changed
See breakdown by country
AU

Exercise normal precautions

Changed Checked www.smartraveller.gov.au
CA

Exercise normal precautions

Changed Checked travel.gc.ca
DE

Exercise normal precautions

Changed Checked www.auswaertiges-amt.de
UK

Exercise normal precautions

Changed Checked www.gov.uk
US

Exercise normal precautions

Changed Checked travel.state.gov

Parts of South Korea carry a higher advisory — up to level 4, "Do not travel". The governments concerned name a region rather than a boundary, so the carve-out is not drawn on the map and is not reflected in the combined level above. Follow the source links for where it applies.

Climate at a glance · 10-year ERA5

A decade of weather, in one page

Temperature°C
Temperature · 12-month climatologySouth Korea. Average daytime high by month in °C. Lowest in January (3.9), highest in August (29.6). Monthly means: 3.9, 6.1, 12.5, 18.0, 22.5, 26.2, 28.7, 29.6, 25.4, 19.5, 13.1, 5.3.
— daytime high— overnight low▬ typical range
View data table
MonthAverage daytime high (°C)Average overnight low (°C)Typical lowTypical high
January3.9-4.6-11.69.5
February6.1-2.7-8.713.1
March12.52.7-2.519.9
April18.08.02.424.0
May22.512.97.727.2
June26.218.214.130.1
July28.722.618.932.8
August29.623.018.633.1
September25.418.112.930.0
October19.510.84.424.9
November13.13.7-2.219.5
December5.3-3.0-9.711.7
Rainfallmm
Rainfall · 12-month climatologySouth Korea. Rainfall by month in mm. Lowest in January (31), highest in July (251). Monthly means: 31, 37, 62, 81, 98, 141, 251, 203, 184, 96, 46, 33.
View data table
MonthRainfall (mm)
January31
February37
March62
April81
May98
June141
July251
August203
September184
October96
November46
December33
Sunshinehr / day
Sunshine · 12-month climatologySouth Korea. Sunshine hours by month in hr / day. Lowest in July (4.5), highest in March (7.2). Monthly means: 6.1, 6.9, 7.2, 7.2, 7.1, 6.2, 4.5, 4.9, 4.8, 5.5, 5.7, 5.6.
View data table
MonthSunshine hours (hr / day)
January6.1
February6.9
March7.2
April7.2
May7.1
June6.2
July4.5
August4.9
September4.8
October5.5
November5.7
December5.6
Windkm/h
Wind · 12-month climatologySouth Korea. Average wind speed by month in km/h. Lowest in August (8.4), highest in February (11.3). Monthly means: 11.0, 11.3, 10.3, 10.4, 9.8, 8.4, 8.8, 8.4, 8.7, 9.0, 9.8, 10.9.
— average▬ typical range
View data table
MonthAverage wind speed (km/h)Typical lowTypical high
January11.05.818.6
February11.35.819.5
March10.36.017.8
April10.46.317.5
May9.85.716.1
June8.45.214.4
July8.84.915.1
August8.44.615.0
September8.74.615.6
October9.05.115.6
November9.85.317.3
December10.95.718.0
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Snow depth

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Sea surface temperature

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Heat index

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Humidity

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← Earlier
August

Around 30 °C with 203 mm of rain and 4.9 hours of sun a day.

Later →
October

Around 20 °C with 96 mm of rain and 5.5 hours of sun a day.

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