S
M
T
W
T
F
S
30
73°
63°
31
72°
59°
1
72°
57°
2
70°
63°
3
79°
66°
4
70°
59°
5
73°
55°
6
81°
59°
7
77°
64°
8
64°
57°
9
66°
54°
10
70°
57°
11
70°
61°
12
73°
57°
13
73°
64°
14
77°
64°
15
73°
61°
16
68°
57°
17
70°
57°
18
68°
54°
19
72°
63°
20
68°
57°
21
73°
52°
22
77°
59°
23
73°
57°
24
70°
54°
25
75°
55°
26
70°
55°
27
72°
55°
28
66°
58°
29
76°
65°
30
72°
55°
1
68°
53°
2
70°
52°
3
69°
55°
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 66° to 76°, with overnight lows between 52° and 65°. The average high for September is 70° with an average low of 56°. 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.
