S
M
T
W
T
F
S
30
66°
45°
31
69°
48°
1
70°
51°
2
66°
50°
3
67°
48°
4
67°
48°
5
69°
47°
6
66°
48°
7
70°
50°
8
70°
49°
9
68°
49°
10
68°
50°
11
69°
50°
12
70°
48°
13
69°
44°
14
68°
46°
15
61°
47°
16
68°
41°
17
67°
39°
18
58°
43°
19
59°
46°
20
63°
45°
21
64°
47°
22
66°
44°
23
59°
39°
24
60°
39°
25
Hist. Avg.
58°
39°
26
Hist. Avg.
58°
38°
27
Hist. Avg.
57°
38°
28
Hist. Avg.
57°
38°
29
Hist. Avg.
56°
38°
30
Hist. Avg.
56°
37°
1
Hist. Avg.
56°
37°
2
Hist. Avg.
55°
37°
3
Hist. Avg.
55°
37°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Corner Brook
Corner Brook's September 2026 forecast shows daily high temperatures ranging from 58° to 70°, with overnight lows between 39° and 51°. The average high for September is 66° with an average low of 46°. 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 Corner Brook. See also: October | November | December.
