S
M
T
W
T
F
S
30
68°
49°
31
67°
48°
1
70°
49°
2
70°
53°
3
70°
53°
4
69°
48°
5
67°
47°
6
65°
49°
7
68°
51°
8
70°
48°
9
70°
52°
10
69°
52°
11
70°
51°
12
70°
49°
13
67°
45°
14
65°
49°
15
64°
50°
16
63°
51°
17
64°
51°
18
68°
50°
19
67°
51°
20
67°
51°
21
68°
47°
22
67°
45°
23
62°
43°
24
62°
44°
25
63°
45°
26
62°
45°
27
63°
46°
28
61°
50°
29
64°
49°
30
65°
48°
1
64°
49°
2
65°
48°
3
59°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Clapham
Clapham's September 2026 forecast shows daily high temperatures ranging from 59° to 70°, with overnight lows between 41° and 53°. The average high for September is 66° with an average low of 48°. 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 Clapham. See also: October | November | December.
