S
M
T
W
T
F
S
30
81°
55°
31
76°
50°
1
74°
50°
2
73°
51°
3
73°
49°
4
74°
50°
5
75°
57°
6
74°
56°
7
78°
57°
8
81°
55°
9
80°
55°
10
75°
56°
11
81°
56°
12
82°
55°
13
80°
57°
14
77°
54°
15
81°
44°
16
74°
44°
17
70°
43°
18
70°
45°
19
71°
48°
20
70°
52°
21
76°
51°
22
69°
51°
23
76°
52°
24
77°
51°
25
75°
52°
26
77°
52°
27
77°
45°
28
76°
39°
29
74°
40°
30
64°
44°
1
63°
40°
2
65°
45°
3
64°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in West Cornwall
West Cornwall's September 2026 forecast shows daily high temperatures ranging from 63° to 82°, with overnight lows between 39° and 57°. The average high for September is 74° 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 West Cornwall. See also: October | November | December.
