Seoul climate by month
Averages and records for each calendar month at Seoul, South Korea, from 1973 to 2025. The warmest month is August, averaging 29.8°C; the coolest is January at 1.6°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 1.6°C | – | 13.5°C15 January 2002 | −19.2°C5 January 1986 | 44 / 53 |
| February | 4.5°C | – | 18.7°C20 February 2004 | −17.1°C2 February 2012 | 40 / 53 |
| March | 10.5°C | – | 23.8°C9 March 2013 | −15.3°C2 March 2006 | 43 / 53 |
| April | 17.7°C | – | 29.8°C30 April 2005 | −9.4°C3 April 2004 | 43 / 53 |
| May | 23.3°C | 11.2°C | 33.3°C31 May 2014 | −2.1°C9 May 2007 | 45 / 53 |
| June | 27.3°C | – | 35.0°C28 June 1976 | 7.0°C4 June 1973 | 44 / 53 |
| July | 28.9°C | – | 38.4°C24 July 1994 | 10.9°C19 July 2007 | 41 / 53 |
| August | 29.8°C | 20.0°C | 38.1°C6 August 2001 | 12.5°C19 August 2005 | 45 / 53 |
| September | 26.0°C | – | 36.0°C7 September 1975 | 3.9°C21 September 2005 | 40 / 52 |
| October | 20.0°C | – | 29.0°C1 October 1977 | −2.0°C31 October 1997 | 44 / 52 |
| November | 11.8°C | – | 28.0°C12 November 1975 | −11.0°C14 November 1979 | 39 / 52 |
| December | 4.0°C | – | 15.9°C4 December 2002 | −18.0°C27 December 1976 | 41 / 52 |
Years shows the number behind the average high, then the number holding a record for that month. They differ because a year contributes an average only when the month has at least 25 days of readings, while a single reading is enough to set a record. The average low is withheld on the same 25-day rule and is counted separately again; it is shown as a dash where the archive cannot support it. Across the twelve months here the averages rest on 39 to 45 years each.
See what Seoul is doing right now
Every figure on this page is computed from NOAA GHCN-Daily observations stored per station, per year, per month. Nothing is modelled, interpolated or estimated, and a month the archive never covered is left out rather than filled in. A station appears here only once all twelve months carry an average from at least 10 years. See how this is built.