S
M
T
W
T
F
S
30
68°
50°
31
68°
52°
1
67°
52°
2
68°
51°
3
68°
49°
4
67°
49°
5
68°
52°
6
67°
47°
7
68°
51°
8
68°
50°
9
70°
50°
10
71°
49°
11
68°
51°
12
67°
47°
13
69°
50°
14
69°
49°
15
68°
44°
16
64°
48°
17
67°
45°
18
68°
48°
19
68°
51°
20
67°
51°
21
68°
50°
22
68°
50°
23
66°
49°
24
67°
48°
25
65°
49°
26
64°
48°
27
65°
49°
28
66°
48°
29
66°
47°
30
65°
46°
1
Hist. Avg.
61°
49°
2
Hist. Avg.
61°
48°
3
Hist. Avg.
61°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in London
London's September 2026 forecast shows daily high temperatures ranging from 64° to 71°, with overnight lows between 44° and 52°. The average high for September is 67° with an average low of 49°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in London. See also: October | November | December.
