Historical Ranked Daily Data for Sep - Night Minimum (21-09) / °C
Weather Variable:
| Highest | ||
| Rank | Value | Date |
| 1 | 19.9 | 06 Sep 2016 |
| 2 | 19.3 | 11 Sep 2023 |
| 3 | 19.0 | 14 Sep 2016 |
| 4 | 18.5 | 07 Sep 2016 |
| 5 | 18.4 | 16 Sep 2020 |
| 6 | 18.3 | 02 Sep 2024 |
| 7 | 18.0 | 10 Sep 2023 |
| 8 | 17.8 | 08 Sep 2016 |
| 9 | 17.8 | 10 Sep 2011 |
| 10 | 17.7 | 18 Sep 2025 |
| 11 | 17.7 | 12 Sep 2023 |
| 12 | 17.7 | 13 Sep 2016 |
| 13 | 17.6 | 09 Sep 2023 |
| 14 | 17.6 | 07 Sep 2023 |
| 15 | 17.6 | 18 Sep 2018 |
| 16 | 17.4 | 08 Sep 2023 |
| 17 | 17.3 | 06 Sep 2024 |
| 18 | 17.3 | 11 Sep 2021 |
| 19 | 17.3 | 17 Sep 2018 |
| 20 | 17.2 | 10 Sep 2021 |
| 21 | 17.1 | 19 Sep 2018 |
| 22 | 17.0 | 03 Sep 2024 |
| 23 | 17.0 | 15 Sep 2016 |
| 24 | 16.9 | 20 Sep 2023 |
| 25 | 16.9 | 08 Sep 2009 |
| Lowest | ||
| Rank | Value | Date |
| 1 | 3.9 | 23 Sep 2025 |
| 2 | 4.4 | 25 Sep 2018 |
| 3 | 4.4 | 29 Sep 2024 |
| 4 | 4.9 | 29 Sep 2022 |
| 5 | 5.0 | 17 Sep 2022 |
| 6 | 5.1 | 28 Sep 2024 |
| 7 | 5.4 | 14 Sep 2024 |
| 8 | 5.6 | 25 Sep 2010 |
| 9 | 5.6 | 06 Sep 2015 |
| 10 | 5.8 | 30 Sep 2012 |
| 11 | 5.9 | 29 Sep 2025 |
| 12 | 6.0 | 22 Sep 2012 |
| 13 | 6.1 | 24 Sep 2018 |
| 14 | 6.1 | 13 Sep 2024 |
| 15 | 6.2 | 29 Sep 2018 |
| 16 | 6.2 | 12 Sep 2024 |
| 17 | 6.3 | 01 Sep 2020 |
| 18 | 6.3 | 28 Sep 2022 |
| 19 | 6.3 | 30 Sep 2025 |
| 20 | 6.5 | 26 Sep 2020 |
| 21 | 6.7 | 15 Sep 2013 |
| 22 | 6.8 | 18 Sep 2010 |
| 23 | 6.8 | 13 Sep 2018 |
| 24 | 6.9 | 19 Sep 2012 |
| 25 | 6.9 | 22 Sep 2017 |
Ranked daily data from 2009 to present for London, NW3. For Night Minimum (21-09), there are 510 valid values in Sep.