S
M
T
W
T
F
S
30
86°
47°
31
84°
53°
1
85°
53°
2
85°
52°
3
84°
48°
4
85°
45°
5
83°
44°
6
75°
42°
7
74°
42°
8
74°
51°
9
73°
44°
10
75°
50°
11
77°
41°
12
73°
46°
13
74°
50°
14
75°
47°
15
72°
43°
16
70°
44°
17
72°
49°
18
75°
48°
19
79°
44°
20
79°
42°
21
78°
42°
22
71°
39°
23
68°
41°
24
70°
48°
25
69°
38°
26
68°
40°
27
68°
41°
28
69°
43°
29
67°
38°
30
66°
40°
1
66°
46°
2
71°
47°
3
73°
43°
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 86°, with overnight lows between 38° and 53°. The average high for September is 75° with an average low of 45°. 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.
