S
M
T
W
T
F
S
26
81°
58°
27
84°
63°
28
80°
65°
29
81°
66°
30
78°
64°
31
84°
64°
1
86°
67°
2
83°
71°
3
81°
65°
4
83°
61°
5
89°
63°
6
89°
75°
7
90°
71°
8
87°
69°
9
87°
71°
10
86°
67°
11
83°
70°
12
83°
67°
13
83°
67°
14
84°
65°
15
81°
62°
16
79°
63°
17
79°
66°
18
84°
66°
19
85°
63°
20
83°
63°
21
77°
62°
22
75°
64°
23
81°
67°
24
82°
61°
25
79°
61°
26
81°
67°
27
80°
68°
28
82°
63°
29
81°
60°
30
80°
63°
31
78°
63°
1
77°
60°
2
78°
60°
3
76°
59°
4
76°
58°
5
78°
59°
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 76° to 82°, with overnight lows between 58° and 68°. The average high for August is 79° with an average low of 62°. 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.
