S
M
T
W
T
F
S
30
75°
59°
31
72°
55°
1
70°
52°
2
68°
57°
3
72°
63°
4
66°
59°
5
68°
55°
6
72°
54°
7
70°
61°
8
64°
55°
9
63°
54°
10
N/A
11
64°
46°
12
64°
55°
13
64°
50°
14
68°
53°
15
62°
50°
16
64°
53°
17
62°
53°
18
61°
52°
19
63°
51°
20
64°
53°
21
63°
52°
22
64°
53°
23
66°
55°
24
64°
54°
25
60°
54°
26
60°
53°
27
63°
54°
28
63°
50°
29
57°
48°
30
58°
51°
1
58°
53°
2
62°
54°
3
62°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Grimsby
Grimsby's September 2026 forecast shows daily high temperatures ranging from 57° to 68°, with overnight lows between 46° and 55°. The average high for September is 62° with an average low of 52°. 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 Grimsby. See also: October | November | December.
