S
M
T
W
T
F
S
30
87°
66°
31
89°
67°
1
90°
66°
2
87°
61°
3
85°
62°
4
85°
66°
5
86°
66°
6
90°
67°
7
90°
64°
8
88°
61°
9
88°
59°
10
85°
59°
11
85°
60°
12
86°
59°
13
85°
58°
14
84°
59°
15
85°
62°
16
85°
65°
17
84°
66°
18
84°
65°
19
80°
65°
20
81°
64°
21
82°
64°
22
87°
65°
23
85°
64°
24
83°
64°
25
88°
63°
26
88°
60°
27
87°
58°
28
83°
60°
29
80°
63°
30
84°
63°
1
87°
64°
2
88°
62°
3
87°
60°
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 80° to 90°, with overnight lows between 58° and 67°. The average high for September is 86° with an average low of 63°. 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.
