S
M
T
W
T
F
S
31
72°
46°
1
80°
49°
2
79°
52°
3
74°
56°
4
69°
49°
5
63°
50°
6
61°
47°
7
68°
50°
8
59°
52°
9
64°
51°
10
67°
51°
11
69°
47°
12
74°
54°
13
81°
55°
14
87°
57°
15
76°
64°
16
71°
58°
17
71°
55°
18
76°
53°
19
72°
55°
20
77°
50°
21
87°
53°
22
92°
57°
23
94°
55°
24
85°
51°
25
70°
56°
26
67°
55°
27
69°
56°
28
71°
55°
29
75°
55°
30
75°
54°
1
74°
56°
2
74°
55°
3
76°
53°
4
70°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
June Weather in Grantham
Grantham's June 2026 forecast shows daily high temperatures ranging from 67° to 94°, with overnight lows between 50° and 57°. The average high for June is 77° with an average low of 54°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how June weather will actually feel in Grantham. See also: July | August | September.
