Weather on September 20 in London
Historical weather data for September 20 in London, United Kingdom
Based on 55 years of data from HAMPSTEAD
About This Date
September 20th in London, United Kingdom typically brings mild fall weather, with average highs around 18°C and lows near 11°C. Over 55 years of records, the warmest September 20th was in 2024 (19°C average), while the coldest was 1974 (10°C) — a 17°F range across recorded history. Rain or other precipitation has occurred on about 36% of September 20th dates historically, with the wettest September 20th recording 4.48" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for September 20th in London? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip |
|---|---|---|---|
| 2025 | 15°C (59°F) | 13°C (55°F) | 0.08" |
| 2024 | 24°C (75°F) | 15°C (59°F) | 0" |
| 2023 | 21°C (70°F) | -- | 0" |
| 2022 | 20°C (68°F) | 9°C (48°F) | 0" |
| 2021 | 21°C (69°F) | -- | 0.38" |
| 2020 | -- | 14°C (57°F) | 0" |
| 2019 | -- | 9°C (49°F) | 0" |
| 2018 | 22°C (71°F) | 16°C (61°F) | 0" |
| 2017 | 17°C (62°F) | 6°C (43°F) | 0" |
| 2016 | -- | 14°C (58°F) | 0.18" |
| 2015 | 14°C (58°F) | 9°C (48°F) | 0" |
| 2014 | 17°C (63°F) | 16°C (60°F) | 0.04" |
| 2013 | 18°C (64°F) | 9°C (48°F) | 0" |
| 2012 | 16°C (61°F) | 7°C (45°F) | 0" |
| 2011 | 18°C (64°F) | 13°C (55°F) | 0.38" |
| 2010 | 21°C (70°F) | 13°C (56°F) | 0" |
| 2009 | 21°C (69°F) | 12°C (54°F) | 0.02" |
| 2008 | 19°C (67°F) | 9°C (48°F) | 0" |
| 2007 | 18°C (65°F) | 12°C (53°F) | 0.11" |
| 2006 | 23°C (73°F) | 12°C (54°F) | 0" |
| 2005 | 22°C (71°F) | 10°C (50°F) | 0" |
| 2004 | 16°C (60°F) | 13°C (55°F) | 0.02" |
| 2003 | 27°C (80°F) | 12°C (53°F) | 0" |
| 2002 | 19°C (66°F) | 12°C (54°F) | 0" |
| 2001 | 16°C (60°F) | 11°C (52°F) | 0.16" |
| 2000 | 18°C (65°F) | 11°C (51°F) | 0" |
| 1999 | 20°C (68°F) | 14°C (57°F) | 1.55" |
| 1998 | 20°C (68°F) | 13°C (55°F) | 0" |
| 1997 | 18°C (65°F) | 13°C (56°F) | 0" |
| 1996 | 15°C (59°F) | 11°C (51°F) | -- |
| 1995 | 19°C (66°F) | 12°C (53°F) | 0" |
| 1994 | 18°C (65°F) | 10°C (50°F) | 0.18" |
| 1993 | 19°C (66°F) | 13°C (55°F) | 0.75" |
| 1992 | 17°C (62°F) | 11°C (51°F) | 0" |
| 1991 | 23°C (74°F) | 9°C (48°F) | 0" |
| 1990 | 15°C (59°F) | 7°C (44°F) | 0.01" |
| 1989 | 25°C (77°F) | 13°C (55°F) | 0" |
| 1988 | 17°C (62°F) | 8°C (47°F) | 0" |
| 1987 | 21°C (70°F) | 14°C (57°F) | 0.02" |
| 1986 | 19°C (67°F) | 7°C (44°F) | 0" |
| 1985 | 18°C (64°F) | 11°C (51°F) | 0" |
| 1984 | 13°C (56°F) | 11°C (52°F) | 2.66" |
| 1983 | 14°C (58°F) | 8°C (47°F) | 0.32" |
| 1982 | 17°C (62°F) | 15°C (59°F) | 0.34" |
| 1981 | 19°C (66°F) | 11°C (52°F) | 0" |
| 1980 | 19°C (67°F) | 16°C (60°F) | 0.4" |
| 1979 | 15°C (59°F) | 9°C (49°F) | 0" |
| 1978 | 22°C (71°F) | 8°C (47°F) | 0" |
| 1977 | 12°C (54°F) | 8°C (46°F) | 0" |
| 1976 | 22°C (71°F) | 11°C (51°F) | 0" |
| 1975 | 18°C (65°F) | 13°C (55°F) | 0.07" |
| 1974 | 13°C (56°F) | 7°C (45°F) | 0" |
| 1973 | 12°C (54°F) | 11°C (51°F) | 4.48" |
| 1972 | 18°C (65°F) | 7°C (44°F) | 0" |
| 1971 | 22°C (71°F) | 9°C (49°F) | 0" |