S
M
T
W
T
F
S
26
82°
60°
27
81°
59°
28
76°
58°
29
76°
58°
30
79°
57°
31
80°
58°
1
80°
58°
2
79°
57°
3
74°
52°
4
74°
52°
5
76°
53°
6
78°
52°
7
76°
52°
8
74°
53°
9
75°
58°
10
80°
59°
11
82°
59°
12
82°
58°
13
83°
59°
14
82°
58°
15
82°
53°
16
81°
51°
17
80°
52°
18
76°
53°
19
74°
53°
20
72°
54°
21
72°
50°
22
73°
50°
23
73°
54°
24
74°
55°
25
75°
55°
26
77°
56°
27
78°
56°
28
79°
56°
29
79°
57°
30
78°
57°
31
77°
54°
1
78°
52°
2
77°
54°
3
73°
51°
4
70°
53°
5
69°
47°
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 69° to 83°, with overnight lows between 47° and 60°. The average high for August is 77° with an average low of 55°. 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.
