S
M
T
W
T
F
S
30
82°
66°
31
81°
65°
1
82°
67°
2
81°
66°
3
82°
65°
4
82°
59°
5
79°
57°
6
81°
58°
7
85°
59°
8
85°
62°
9
84°
63°
10
84°
61°
11
77°
55°
12
78°
57°
13
83°
58°
14
83°
54°
15
76°
54°
16
75°
52°
17
76°
53°
18
77°
55°
19
81°
56°
20
78°
55°
21
82°
60°
22
82°
60°
23
81°
59°
24
81°
58°
25
80°
58°
26
80°
59°
27
79°
57°
28
78°
57°
29
80°
56°
30
79°
56°
1
79°
57°
2
78°
55°
3
79°
47°
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 75° to 85°, with overnight lows between 47° and 67°. The average high for September is 80° with an average low of 58°. 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.
