S
M
T
W
T
F
S
26
82°
64°
27
87°
68°
28
86°
68°
29
87°
67°
30
87°
67°
31
81°
66°
1
83°
66°
2
81°
67°
3
81°
65°
4
82°
64°
5
83°
65°
6
82°
66°
7
82°
65°
8
81°
64°
9
81°
67°
10
79°
67°
11
81°
66°
12
80°
65°
13
79°
62°
14
80°
61°
15
80°
63°
16
81°
60°
17
79°
61°
18
80°
62°
19
80°
62°
20
84°
66°
21
85°
59°
22
81°
58°
23
79°
57°
24
78°
59°
25
79°
61°
26
80°
64°
27
85°
62°
28
78°
65°
29
80°
64°
30
86°
57°
31
78°
56°
1
77°
57°
2
77°
62°
3
78°
57°
4
79°
64°
5
83°
63°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Old Greenwich
Old Greenwich's August 2026 forecast shows daily high temperatures ranging from 77° to 87°, with overnight lows between 56° and 68°. The average high for August is 81° with an average low of 63°. 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 Old Greenwich. See also: September | October | November.
