Weather on September 21 in Seoul
Historical weather data for September 21 in Seoul, South Korea
Avg High24°C (76°F)
Avg Low15°C (59°F)
Warmest200824°C
Coldest198616°C
Based on 54 years of data from SEOUL CITY
About This Date
September 21st in Seoul, South Korea typically brings pleasant fall weather, with average highs around 24°C and lows near 15°C. Over 54 years of records, the warmest September 21st was in 2008 (24°C average), while the coldest was 1986 (16°C) — a 15°F range across recorded history. Rain or other precipitation has occurred on about 22% of September 21st dates historically, with the wettest September 21st recording 25.91" of rain.
Planning for September 21st in Seoul? Great weather for outdoor activities.
Year by Year History
| Year | High | Low | Precip |
|---|---|---|---|
| 2025 | 26°C (78°F) | 19°C (66°F) | -- |
| 2024 | -- | 17°C (63°F) | -- |
| 2022 | -- | 13°C (55°F) | -- |
| 2021 | -- | 18°C (65°F) | 0.08" |
| 2020 | -- | 13°C (56°F) | -- |
| 2019 | -- | 16°C (60°F) | -- |
| 2018 | -- | 18°C (64°F) | 1.75" |
| 2017 | -- | 14°C (58°F) | 0" |
| 2016 | 26°C (78°F) | 14°C (58°F) | -- |
| 2015 | 29°C (85°F) | 17°C (62°F) | -- |
| 2014 | 26°C (78°F) | -- | -- |
| 2013 | 28°C (82°F) | 20°C (68°F) | -- |
| 2012 | 24°C (76°F) | -- | -- |
| 2011 | 24°C (75°F) | -- | -- |
| 2010 | 25°C (77°F) | -- | 25.91" |
| 2009 | 22°C (71°F) | -- | 3.1" |
| 2008 | 29°C (85°F) | 18°C (64°F) | -- |
| 2007 | 23°C (74°F) | -- | 1.96" |
| 2006 | 28°C (83°F) | -- | -- |
| 2005 | -- | 4°C (39°F) | 3.96" |
| 2004 | 20°C (68°F) | -- | 1.6" |
| 2003 | 24°C (76°F) | -- | -- |
| 2002 | 24°C (76°F) | -- | -- |
| 2001 | 24°C (76°F) | -- | -- |
| 2000 | 26°C (78°F) | 18°C (65°F) | -- |
| 1999 | 18°C (65°F) | 13°C (55°F) | 4.39" |
| 1998 | 24°C (75°F) | -- | 3.61" |
| 1997 | 22°C (72°F) | 11°C (51°F) | 0" |
| 1996 | 26°C (78°F) | 12°C (53°F) | -- |
| 1995 | 25°C (77°F) | 14°C (57°F) | -- |
| 1994 | 25°C (77°F) | -- | 0" |
| 1993 | 28°C (82°F) | 17°C (62°F) | -- |
| 1992 | 26°C (79°F) | -- | 0" |
| 1991 | 24°C (75°F) | 15°C (59°F) | -- |
| 1990 | 27°C (80°F) | 15°C (59°F) | -- |
| 1989 | 24°C (75°F) | 16°C (60°F) | -- |
| 1988 | 27°C (81°F) | 13°C (56°F) | -- |
| 1987 | 23°C (73°F) | -- | 1.19" |
| 1986 | 18°C (64°F) | 13°C (56°F) | 3.61" |
| 1985 | 21°C (70°F) | 16°C (60°F) | -- |
| 1984 | 27°C (80°F) | 15°C (59°F) | -- |
| 1983 | 27°C (80°F) | -- | 0.03" |
| 1982 | 22°C (72°F) | 11°C (52°F) | -- |
| 1981 | 29°C (84°F) | 18°C (64°F) | -- |
| 1980 | 21°C (70°F) | -- | -- |
| 1979 | 26°C (79°F) | 18°C (64°F) | -- |
| 1978 | 25°C (77°F) | 14°C (57°F) | 0" |
| 1977 | 20°C (68°F) | -- | 0" |
| 1976 | 23°C (73°F) | 14°C (58°F) | 0" |
| 1975 | 26°C (79°F) | 17°C (63°F) | 0" |
| 1974 | 25°C (77°F) | -- | 0" |
| 1973 | 26°C (79°F) | 17°C (63°F) | 0" |
| 1972 | 24°C (75°F) | 14°C (57°F) | 0" |
| 1971 | 27°C (80°F) | 16°C (60°F) | 0" |