S
M
T
W
T
F
S
27
59°
54°
28
57°
55°
29
63°
54°
30
66°
55°
1
71°
54°
2
78°
53°
3
65°
38°
4
63°
37°
5
63°
41°
6
58°
33°
7
63°
46°
8
66°
44°
9
62°
36°
10
64°
44°
11
68°
54°
12
66°
46°
13
62°
40°
14
53°
39°
15
55°
34°
16
56°
39°
17
59°
40°
18
56°
35°
19
59°
36°
20
56°
32°
21
49°
27°
22
50°
34°
23
49°
27°
24
47°
26°
25
49°
36°
26
58°
37°
27
54°
26°
28
45°
26°
29
45°
25°
30
46°
34°
31
51°
26°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
October Weather in Grantham
Grantham's October 2026 forecast shows daily high temperatures ranging from 45° to 68°, with overnight lows between 25° and 54°. The average high for October is 56° with an average low of 36°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how October weather will actually feel in Grantham. See also: November | December | January.
