S
M
T
W
T
F
S
30
99°
71°
31
N/A
1
96°
71°
2
97°
75°
3
99°
74°
4
96°
73°
5
96°
68°
6
97°
67°
7
96°
68°
8
95°
67°
9
94°
67°
10
93°
65°
11
88°
62°
12
83°
62°
13
84°
64°
14
90°
67°
15
89°
66°
16
90°
66°
17
91°
65°
18
90°
65°
19
90°
64°
20
89°
65°
21
89°
65°
22
85°
64°
23
80°
64°
24
80°
63°
25
82°
62°
26
82°
63°
27
84°
62°
28
87°
62°
29
86°
61°
30
86°
61°
1
85°
60°
2
86°
61°
3
85°
61°
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 99°, with overnight lows between 60° and 75°. The average high for September is 89° with an average low of 65°. 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.
