S
M
T
W
T
F
S
26
79°
61°
27
82°
55°
28
78°
54°
29
75°
60°
30
81°
59°
31
77°
54°
1
80°
53°
2
75°
53°
3
74°
54°
4
75°
53°
5
75°
53°
6
76°
54°
7
77°
54°
8
81°
57°
9
76°
60°
10
77°
60°
11
78°
59°
12
83°
59°
13
80°
58°
14
82°
53°
15
75°
51°
16
75°
53°
17
77°
52°
18
74°
50°
19
73°
53°
20
74°
52°
21
75°
53°
22
75°
51°
23
72°
57°
24
76°
55°
25
73°
52°
26
78°
59°
27
81°
58°
28
76°
58°
29
81°
56°
30
81°
50°
31
72°
49°
1
72°
48°
2
71°
55°
3
73°
55°
4
76°
48°
5
71°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Groton
Groton's August 2026 forecast shows daily high temperatures ranging from 71° to 83°, with overnight lows between 47° and 61°. The average high for August is 76° 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 August weather will actually feel in Groton. See also: September | October | November.
