S
M
T
W
T
F
S
30
89°
64°
31
90°
62°
1
91°
62°
2
88°
61°
3
87°
62°
4
87°
62°
5
88°
63°
6
88°
62°
7
87°
60°
8
87°
62°
9
86°
64°
10
87°
65°
11
88°
63°
12
90°
66°
13
91°
67°
14
92°
67°
15
93°
65°
16
92°
65°
17
91°
66°
18
91°
65°
19
90°
65°
20
89°
64°
21
91°
66°
22
91°
64°
23
90°
65°
24
88°
62°
25
80°
57°
26
79°
60°
27
81°
61°
28
80°
60°
29
82°
59°
30
80°
62°
1
79°
60°
2
78°
59°
3
86°
63°
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 78° to 93°, with overnight lows between 57° and 67°. The average high for September is 87° 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.
