Inchon climate by month
Averages and records for each calendar month at Inchon, South Korea, from 1949 to 2026. The warmest month is August, averaging 28.9°C; the coolest is January at 1.3°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 1.3°C | −6.3°C | 15.8°C14 January 2002 | −19.0°C5 January 1970 | 66 / 77 |
| February | 3.6°C | −4.2°C | 18.2°C20 February 2004 | −18.3°C12 February 2005 | 66 / 77 |
| March | 8.9°C | 0.7°C | 23.1°C26 March 2025 | −11.0°C4 March 1977 | 68 / 77 |
| April | 15.6°C | 6.9°C | 32.7°C30 April 2005 | −7.7°C20 April 2006 | 69 / 77 |
| May | 20.9°C | 12.3°C | 31.2°C23 May 1991 | 0.4°C9 May 2004 | 69 / 77 |
| June | 24.8°C | 17.0°C | 33.8°C19 June 2012 | 6.4°C6 June 2003 | 67 / 76 |
| July | 27.5°C | 21.4°C | 37.2°C26 July 1994 | 10.0°C3 July 2004 | 67 / 76 |
| August | 28.9°C | 22.3°C | 38.9°C16 August 1949 | 8.7°C26 August 2003 | 69 / 76 |
| September | 25.3°C | 17.0°C | 33.4°C2 September 2001 | 7.7°C27 September 1957 | 67 / 76 |
| October | 19.5°C | 10.3°C | 28.5°C2 October 1977 | −1.0°C31 October 1997 | 67 / 75 |
| November | 11.6°C | 3.4°C | 23.9°C5 November 2011 | −12.0°C14 November 1979 | 62 / 75 |
| December | 4.1°C | −3.3°C | 17.5°C3 December 2004 | −17.0°C17 December 1965 | 63 / 75 |
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 62 to 69 years each.
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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.