S
M
T
W
T
F
S
30
73°
53°
31
73°
52°
1
72°
53°
2
72°
52°
3
70°
51°
4
71°
52°
5
71°
52°
6
72°
51°
7
71°
52°
8
71°
52°
9
70°
51°
10
69°
49°
11
69°
50°
12
70°
51°
13
69°
48°
14
69°
49°
15
67°
49°
16
67°
48°
17
68°
44°
18
68°
49°
19
63°
48°
20
65°
49°
21
68°
48°
22
67°
49°
23
63°
45°
24
64°
47°
25
62°
44°
26
Hist. Avg.
62°
50°
27
Hist. Avg.
62°
49°
28
Hist. Avg.
62°
49°
29
Hist. Avg.
62°
49°
30
Hist. Avg.
61°
49°
1
Hist. Avg.
61°
49°
2
Hist. Avg.
61°
48°
3
Hist. Avg.
61°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Clapham
Clapham's September 2026 forecast shows daily high temperatures ranging from 62° to 73°, with overnight lows between 44° and 53°. The average high for September is 69° with an average low of 50°. 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.
