Weather on September 15 in London
Historical weather data for September 15 in London, United Kingdom
Based on 55 years of data from HAMPSTEAD
About This Date
September 15th in London, United Kingdom typically brings mild fall weather, with average highs around 19°C and lows near 11°C. Over 55 years of records, the warmest September 15th was in 2003 (19°C average), while the coldest was 1972 (10°C) — a 17°F range across recorded history. Rain or other precipitation has occurred on about 36% of September 15th dates historically, with the wettest September 15th recording 5.32" of rain. The last decade has been 2.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.5°F warmer on this date compared to 20-30 years ago.
Planning for September 15th in London? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip (mm) |
|---|---|---|---|
| 2025 | 18°C (65°F) | 12°C (53°F) | 1 mm |
| 2024 | 20°C (68°F) | 9°C (48°F) | 0 mm |
| 2023 | 26°C (78°F) | 12°C (53°F) | 0 mm |
| 2022 | 20°C (68°F) | 13°C (55°F) | 0 mm |
| 2021 | 22°C (72°F) | 14°C (57°F) | 0 mm |
| 2020 | 23°C (74°F) | 13°C (56°F) | 0 mm |
| 2019 | -- | 10°C (50°F) | 0 mm |
| 2018 | 23°C (73°F) | 8°C (47°F) | 1 mm |
| 2017 | -- | 7°C (45°F) | 0 mm |
| 2016 | 17°C (62°F) | 16°C (60°F) | 78 mm |
| 2015 | 14°C (58°F) | 9°C (49°F) | 3 mm |
| 2014 | 23°C (74°F) | 12°C (54°F) | 0 mm |
| 2013 | 14°C (58°F) | 7°C (44°F) | 9 mm |
| 2012 | 18°C (64°F) | 8°C (47°F) | 0 mm |
| 2011 | 22°C (71°F) | 8°C (46°F) | 0 mm |
| 2010 | 17°C (63°F) | 8°C (47°F) | 0 mm |
| 2009 | 18°C (65°F) | 13°C (55°F) | 135 mm |
| 2008 | 18°C (64°F) | 9°C (49°F) | 0 mm |
| 2007 | 21°C (69°F) | 8°C (47°F) | 0 mm |
| 2006 | 22°C (71°F) | 14°C (57°F) | 0 mm |
| 2005 | 20°C (68°F) | 13°C (56°F) | 31 mm |
| 2004 | 18°C (65°F) | 8°C (46°F) | 0 mm |
| 2003 | 27°C (81°F) | 12°C (53°F) | 0 mm |
| 2002 | 18°C (65°F) | 13°C (55°F) | 0 mm |
| 2001 | 17°C (63°F) | 10°C (50°F) | 0 mm |
| 2000 | 17°C (62°F) | 16°C (60°F) | 107 mm |
| 1999 | 18°C (64°F) | 12°C (53°F) | 11 mm |
| 1998 | 16°C (61°F) | 10°C (50°F) | 5 mm |
| 1997 | 21°C (70°F) | 8°C (47°F) | 0 mm |
| 1996 | 21°C (70°F) | 8°C (47°F) | -- |
| 1995 | 17°C (62°F) | 11°C (51°F) | 1 mm |
| 1994 | 13°C (56°F) | 9°C (48°F) | 28 mm |
| 1993 | 14°C (57°F) | 8°C (46°F) | 10 mm |
| 1992 | 18°C (64°F) | 9°C (48°F) | 0 mm |
| 1991 | 19°C (66°F) | 13°C (56°F) | 9 mm |
| 1990 | 16°C (61°F) | 11°C (52°F) | 0 mm |
| 1989 | 21°C (70°F) | 14°C (57°F) | 3 mm |
| 1988 | 18°C (65°F) | 8°C (47°F) | 1 mm |
| 1987 | 19°C (67°F) | 9°C (48°F) | 0 mm |
| 1986 | 13°C (56°F) | 8°C (46°F) | 12 mm |
| 1985 | 18°C (65°F) | 9°C (48°F) | 0 mm |
| 1984 | 17°C (63°F) | 12°C (53°F) | 0 mm |
| 1983 | 16°C (60°F) | 13°C (55°F) | 8 mm |
| 1982 | 24°C (75°F) | 13°C (55°F) | 0 mm |
| 1981 | 17°C (63°F) | 13°C (55°F) | 0 mm |
| 1980 | 19°C (67°F) | 13°C (55°F) | 0 mm |
| 1979 | 19°C (67°F) | 6°C (42°F) | 0 mm |
| 1978 | 22°C (71°F) | 11°C (51°F) | 0 mm |
| 1977 | 15°C (59°F) | 8°C (46°F) | 0 mm |
| 1976 | 14°C (58°F) | 10°C (50°F) | 0 mm |
| 1975 | 14°C (58°F) | 6°C (42°F) | 0 mm |
| 1974 | 21°C (70°F) | 10°C (50°F) | 12 mm |
| 1973 | 22°C (72°F) | 13°C (55°F) | 4 mm |
| 1972 | 15°C (59°F) | 5°C (41°F) | 0 mm |
| 1971 | 16°C (61°F) | 10°C (50°F) | 0 mm |