S
M
T
W
T
F
S
30
68°
63°
31
76°
65°
1
88°
70°
2
85°
67°
3
83°
65°
4
74°
64°
5
78°
59°
6
77°
55°
7
77°
54°
8
79°
64°
9
78°
63°
10
72°
50°
11
73°
54°
12
76°
60°
13
77°
62°
14
71°
56°
15
71°
55°
16
71°
51°
17
69°
54°
18
67°
52°
19
68°
52°
20
73°
56°
21
68°
55°
22
64°
54°
23
66°
54°
24
67°
53°
25
71°
54°
26
71°
53°
27
66°
52°
28
70°
54°
29
71°
55°
30
72°
55°
1
71°
54°
2
68°
50°
3
64°
46°
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 79°, with overnight lows between 46° and 64°. The average high for September is 71° with an average low of 55°. 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.
