S
M
T
W
T
F
S
26
82°
61°
27
83°
63°
28
84°
64°
29
83°
63°
30
83°
62°
31
84°
64°
1
88°
69°
2
89°
69°
3
90°
68°
4
89°
68°
5
89°
62°
6
83°
61°
7
81°
60°
8
82°
61°
9
83°
61°
10
83°
62°
11
85°
63°
12
86°
65°
13
87°
67°
14
86°
66°
15
88°
67°
16
89°
67°
17
88°
66°
18
87°
64°
19
83°
63°
20
80°
65°
21
81°
66°
22
83°
66°
23
81°
61°
24
81°
61°
25
83°
66°
26
86°
59°
27
85°
62°
28
82°
66°
29
85°
66°
30
87°
64°
31
84°
64°
1
85°
63°
2
85°
64°
3
83°
63°
4
84°
63°
5
83°
63°
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 80° to 90°, with overnight lows between 59° and 69°. The average high for August is 85° with an average low of 64°. 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.
