Historical Ranked Daily Data for May - Maximum Temperature / °C
Weather Variable:
| Highest | ||
| Rank | Value | Date |
| 1 | 35.2 | 26 May 2026 |
| 2 | 33.2 | 25 May 2026 |
| 3 | 31.9 | 24 May 2026 |
| 4 | 31.7 | 28 May 2026 |
| 5 | 30.2 | 23 May 2026 |
| 6 | 30.1 | 30 May 2026 |
| 7 | 29.1 | 23 May 2010 |
| 8 | 28.8 | 24 May 2010 |
| 9 | 28.7 | 01 May 2025 |
| 10 | 28.6 | 22 May 2026 |
| 11 | 27.8 | 07 May 2018 |
| 12 | 27.4 | 21 May 2020 |
| 13 | 27.4 | 20 May 2020 |
| 14 | 27.1 | 27 May 2018 |
| 15 | 26.9 | 28 May 2012 |
| 16 | 26.8 | 08 May 2018 |
| 17 | 26.7 | 31 May 2025 |
| 18 | 26.7 | 26 May 2017 |
| 19 | 26.7 | 27 May 2012 |
| 20 | 26.6 | 26 May 2020 |
| 21 | 26.6 | 08 May 2016 |
| 22 | 26.4 | 27 May 2026 |
| 23 | 26.4 | 24 May 2017 |
| 24 | 26.2 | 19 May 2020 |
| 25 | 26.1 | 29 May 2026 |
| Lowest | ||
| Rank | Value | Date |
| 1 | 8.7 | 06 May 2012 |
| 2 | 8.9 | 03 May 2012 |
| 3 | 8.9 | 04 May 2012 |
| 4 | 8.9 | 24 May 2013 |
| 5 | 9.2 | 11 May 2010 |
| 6 | 9.3 | 02 May 2010 |
| 7 | 9.4 | 08 May 2010 |
| 8 | 9.8 | 05 May 2012 |
| 9 | 10.7 | 14 May 2015 |
| 10 | 10.7 | 04 May 2019 |
| 11 | 11.0 | 03 May 2010 |
| 12 | 11.0 | 23 May 2013 |
| 13 | 11.0 | 03 May 2017 |
| 14 | 11.4 | 12 May 2010 |
| 15 | 11.4 | 02 May 2014 |
| 16 | 11.5 | 09 May 2010 |
| 17 | 11.5 | 15 May 2012 |
| 18 | 11.6 | 17 May 2013 |
| 19 | 11.7 | 20 May 2012 |
| 20 | 11.8 | 05 May 2019 |
| 21 | 11.8 | 11 May 2020 |
| 22 | 11.8 | 06 May 2021 |
| 23 | 11.9 | 13 May 2020 |
| 24 | 12.0 | 08 May 2017 |
| 25 | 12.1 | 14 May 2012 |
Ranked daily data from 2009 to present for London, NW3. For Maximum Temperature, there are 558 valid values in May.