S
M
T
W
T
F
S
30
72°
58°
31
75°
61°
1
72°
60°
2
74°
56°
3
69°
52°
4
69°
55°
5
71°
56°
6
71°
59°
7
76°
59°
8
76°
54°
9
67°
51°
10
68°
58°
11
66°
45°
12
64°
52°
13
63°
50°
14
65°
49°
15
64°
47°
16
65°
46°
17
65°
47°
18
64°
45°
19
63°
43°
20
61°
42°
21
62°
42°
22
65°
47°
23
67°
48°
24
71°
53°
25
73°
54°
26
73°
53°
27
71°
49°
28
71°
51°
29
64°
43°
30
61°
50°
1
60°
51°
2
69°
40°
3
71°
38°
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 60° to 76°, with overnight lows between 38° and 61°. The average high for September is 68° with an average low of 50°. 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.
