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
76°
56°
7
76°
55°
8
77°
54°
9
75°
65°
10
76°
58°
11
74°
51°
12
78°
53°
13
78°
56°
14
69°
49°
15
72°
65°
16
76°
61°
17
73°
53°
18
74°
53°
19
66°
56°
20
69°
56°
21
67°
55°
22
66°
50°
23
69°
52°
24
69°
50°
25
67°
50°
26
70°
51°
27
71°
50°
28
65°
51°
29
69°
52°
30
66°
52°
1
66°
53°
2
69°
51°
3
66°
51°
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 65° to 76°, with overnight lows between 50° and 65°. The average high for September is 69° with an average low of 53°. 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.
