Over the last 365 complete days, the highest daily maximum at London Heathrow was 36°C on Aug 13 2026 and the lowest was 2°C on Jan 5 2026. The observed high is the highest temperature in the airport's own METAR reports during the local calendar day. Updated twice a day.
The first check appears after the first archived day ends.
Scorecard appears after 7 checked days (0/7 so far).
| Month | Average high | Warmest day | Coolest day | Days |
|---|---|---|---|---|
| Oct 2026 | 17.1° | 23° | 11° | 29 |
| Sep 2026 | 22.4° | 27° | 18° | 30 |
| Aug 2026 | 26.3° | 36° | 21° | 31 |
| Jul 2026 | 28.3° | 34° | 23° | 31 |
| Jun 2026 | 24.0° | 35° | 16° | 30 |
| May 2026 | 20.8° | 34° | 13° | 31 |
| Apr 2026 | 16.8° | 25° | 12° | 30 |
| Mar 2026 | 12.9° | 18° | 9° | 31 |
| Feb 2026 | 10.6° | 17° | 6° | 28 |
| Jan 2026 | 8.2° | 11° | 2° | 31 |
| Dec 2025 | 10.1° | 15° | 3° | 31 |
| Nov 2025 | 12.1° | 18° | 5° | 30 |
| Oct 2025 | 15.0° | 16° | 14° | 2 |