S
M
T
W
T
F
S
26
80°
67°
27
80°
69°
28
83°
69°
29
83°
68°
30
82°
69°
31
81°
69°
1
81°
68°
2
80°
69°
3
81°
69°
4
80°
68°
5
81°
68°
6
78°
67°
7
80°
69°
8
82°
64°
9
76°
62°
10
75°
62°
11
76°
67°
12
77°
67°
13
76°
66°
14
77°
68°
15
77°
68°
16
79°
66°
17
80°
61°
18
76°
59°
19
76°
63°
20
77°
64°
21
76°
65°
22
81°
63°
23
80°
64°
24
78°
60°
25
74°
59°
26
75°
60°
27
74°
59°
28
73°
58°
29
75°
59°
30
75°
64°
31
79°
65°
1
81°
65°
2
81°
64°
3
80°
58°
4
80°
56°
5
73°
57°
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 73° to 83°, with overnight lows between 56° and 69°. The average high for August is 78° 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 Groton. See also: September | October | November.
