S
M
T
W
T
F
S
26
84°
51°
27
87°
52°
28
81°
58°
29
71°
61°
30
76°
62°
31
81°
58°
1
87°
61°
2
85°
63°
3
82°
58°
4
86°
53°
5
86°
56°
6
91°
60°
7
92°
69°
8
87°
65°
9
86°
61°
10
83°
57°
11
84°
59°
12
83°
54°
13
82°
58°
14
79°
52°
15
78°
51°
16
80°
48°
17
82°
65°
18
83°
63°
19
82°
58°
20
82°
55°
21
81°
53°
22
76°
51°
23
70°
62°
24
77°
56°
25
76°
55°
26
79°
52°
27
81°
55°
28
82°
59°
29
77°
47°
30
74°
52°
31
78°
54°
1
70°
59°
2
67°
59°
3
71°
60°
4
76°
56°
5
73°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Grantham
Grantham's August 2026 forecast shows daily high temperatures ranging from 67° to 76°, with overnight lows between 52° and 60°. The average high for August is 71° with an average low of 57°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Grantham. See also: September | October | November.
