S
M
T
W
T
F
S
30
63°
56°
31
64°
52°
1
63°
53°
2
63°
56°
3
64°
52°
4
64°
51°
5
62°
53°
6
63°
52°
7
65°
53°
8
66°
57°
9
66°
55°
10
62°
56°
11
64°
57°
12
63°
55°
13
66°
56°
14
66°
57°
15
65°
54°
16
65°
52°
17
61°
55°
18
60°
53°
19
65°
49°
20
60°
49°
21
61°
48°
22
60°
50°
23
61°
51°
24
60°
53°
25
59°
55°
26
59°
55°
27
64°
54°
28
63°
51°
29
58°
51°
30
58°
48°
1
59°
48°
2
58°
47°
3
59°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Grimsby
Grimsby's September 2026 forecast shows daily high temperatures ranging from 58° to 66°, with overnight lows between 47° and 57°. The average high for September is 62° with an average low of 53°. 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.
