S
M
T
W
T
F
S
30
81°
62°
31
80°
62°
1
81°
61°
2
78°
60°
3
79°
59°
4
74°
59°
5
76°
61°
6
Hist. Avg.
73°
54°
7
Hist. Avg.
73°
54°
8
Hist. Avg.
73°
54°
9
Hist. Avg.
72°
53°
10
Hist. Avg.
72°
53°
11
Hist. Avg.
72°
53°
12
Hist. Avg.
72°
53°
13
Hist. Avg.
71°
52°
14
Hist. Avg.
71°
52°
15
Hist. Avg.
71°
52°
16
Hist. Avg.
70°
51°
17
Hist. Avg.
70°
51°
18
Hist. Avg.
70°
51°
19
Hist. Avg.
70°
51°
20
Hist. Avg.
69°
50°
21
Hist. Avg.
69°
50°
22
Hist. Avg.
69°
50°
23
Hist. Avg.
69°
50°
24
Hist. Avg.
68°
49°
25
Hist. Avg.
68°
49°
26
Hist. Avg.
68°
49°
27
Hist. Avg.
68°
49°
28
Hist. Avg.
67°
48°
29
Hist. Avg.
67°
48°
30
Hist. Avg.
67°
48°
1
Hist. Avg.
67°
48°
2
Hist. Avg.
66°
47°
3
Hist. Avg.
66°
47°
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 74° to 81°, with overnight lows between 59° and 62°. The average high for September is 78° with an average low of 61°. 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.
