Historical Ranked Periods - Mean Temperature / °C · 5-day mean
Top 5-day mean
#
Value
Date
1
27.2
23–27 Jun 2026
2
26.6
6–10 Jul 2026
3
25.5
8–12 Aug 2020
4
25.0
23–27 Jul 2018
5
24.9
16–20 Jul 2022
6
24.7
22–26 Jul 2019
7
24.7
17–21 Jun 2017
8
24.6
11–15 Aug 2022
9
24.6
27 Jun – 1 Jul 2025
10
24.2
22–26 May 2026
11
23.8
3–7 Aug 2018
12
23.6
13–17 Jul 2013
13
23.6
18–22 Jul 2021
14
23.6
6–10 Sep 2023
15
23.5
18–22 Jun 2025
16
23.5
9–13 Jul 2022
17
23.4
5–9 Jul 2018
18
23.3
26–30 Jul 2026
19
23.2
10–14 Jul 2025
20
23.2
16–20 Jul 2016
21
23.0
5–9 Jul 2017
22
22.9
11–15 Aug 2025
23
22.7
24–28 Aug 2019
24
22.6
18–22 Jun 2026
25
22.5
30 Jun – 4 Jul 2015
Bottom 5-day mean
#
Value
Date
1
-2.3
26 Feb – 2 Mar 2018
2
-2.1
17–21 Dec 2010
3
-1.8
4–8 Jan 2010
4
-1.3
11–15 Dec 2022
5
-1.2
3–7 Jan 2009
6
-1.1
16–20 Jan 2013
7
-1.1
8–12 Feb 2021
8
-1.0
7–11 Feb 2012
9
-0.9
29 Nov – 3 Dec 2010
10
-0.8
31 Jan – 4 Feb 2012
11
-0.6
19–23 Dec 2009
12
-0.3
15–19 Jan 2024
13
-0.2
8–12 Jan 2025
14
-0.2
24–28 Nov 2010
15
-0.1
22–26 Dec 2010
16
-0.1
5–9 Dec 2010
17
-0.1
2–6 Jan 2026
18
0.1
9–13 Jan 2010
19
0.3
1–5 Feb 2009
20
0.6
17–21 Jan 2023
21
0.7
21–25 Jan 2013
22
0.7
23–27 Mar 2013
23
0.8
6–10 Jan 2021
24
0.9
18–22 Jan 2017
25
0.9
6–10 Dec 2022
Mean Temperature 5-day extremes: highest and lowest period means.
There are 6419 valid 5-day periods from 2009 to present in London, NW3 (complete windows only, hiding overlapping windows). Data for Mean Temperature begins in 1881.
Mean air temperature for the day (midnight to midnight, local time), averaged from the logged readings.