S
M
T
W
T
F
S
30
93°
71°
31
94°
72°
1
93°
70°
2
93°
70°
3
92°
72°
4
91°
67°
5
92°
70°
6
93°
71°
7
92°
70°
8
91°
69°
9
91°
70°
10
92°
70°
11
91°
69°
12
90°
68°
13
86°
69°
14
88°
69°
15
86°
68°
16
86°
68°
17
85°
67°
18
85°
65°
19
86°
67°
20
85°
62°
21
83°
61°
22
84°
62°
23
85°
65°
24
86°
64°
25
87°
65°
26
86°
66°
27
87°
65°
28
83°
64°
29
83°
61°
30
86°
64°
1
87°
63°
2
Hist. Avg.
85°
61°
3
Hist. Avg.
85°
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 83° to 94°, with overnight lows between 61° and 72°. The average high for September is 88° with an average low of 67°. 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.
