Historical Ranked Periods - Maximum Temperature / °C · 5-day mean
Top 5-day mean
#
Value
Date
1
33.7
23–27 Jun 2026
2
33.2
7–11 Aug 2020
3
33.0
6–10 Jul 2026
4
32.2
16–20 Jul 2022
5
31.8
22–26 May 2026
6
31.6
11–15 Aug 2022
7
31.5
12–16 Aug 2026
8
31.4
17–21 Jun 2017
9
31.3
23–27 Jul 2018
10
31.1
27 Jun – 1 Jul 2025
11
30.7
22–26 Jul 2019
12
30.6
6–10 Sep 2023
13
30.3
23–27 Aug 2019
14
30.3
18–22 Jul 2021
15
30.2
3–7 Aug 2018
16
30.0
5–9 Jul 2018
17
30.0
13–17 Jul 2013
18
30.0
17–21 Jun 2025
19
29.5
9–13 Jul 2025
20
29.4
25–29 Jul 2026
21
29.3
16–20 Jul 2016
22
29.3
8–12 Jul 2022
23
29.3
11–15 Aug 2025
24
29.1
5–9 Jul 2017
25
29.1
10–14 Jun 2023
Bottom 5-day mean
#
Value
Date
1
-0.2
26 Feb – 2 Mar 2018
2
0.3
17–21 Dec 2010
3
0.3
8–12 Feb 2021
4
0.4
28 Nov – 2 Dec 2010
5
0.4
5–9 Jan 2010
6
0.5
11–15 Dec 2022
7
0.7
16–20 Jan 2013
8
1.1
18–22 Dec 2009
9
1.4
6–10 Jan 2009
10
1.4
22–26 Dec 2010
11
1.4
7–11 Feb 2012
12
1.5
10–14 Jan 2010
13
1.5
31 Jan – 4 Feb 2012
14
1.9
23–27 Mar 2013
15
2.2
21–25 Feb 2013
16
2.2
21–25 Jan 2013
17
2.2
5–9 Dec 2010
18
2.4
2–6 Feb 2009
19
2.5
1–5 Jan 2009
20
2.6
27–31 Jan 2011
21
2.6
8–12 Jan 2025
22
2.7
2–6 Jan 2026
23
2.8
31 Dec 2009 – 4 Jan 2010
24
2.8
15–19 Jan 2024
25
3.1
9–13 Feb 2013
Maximum Temperature 5-day extremes: highest and lowest period means.
There are 6452 valid 5-day periods from 2009 to present in London, NW3 (complete windows only, hiding overlapping windows). Data for Maximum Temperature begins in 1881.
Highest air temperature recorded during the day (midnight to midnight, local time).