S
M
T
W
T
F
S
26
90°
69°
27
87°
68°
28
85°
67°
29
88°
69°
30
91°
70°
31
90°
70°
1
86°
69°
2
90°
68°
3
91°
61°
4
84°
62°
5
86°
62°
6
85°
63°
7
86°
62°
8
85°
61°
9
85°
62°
10
86°
64°
11
87°
67°
12
88°
64°
13
91°
62°
14
84°
62°
15
83°
66°
16
84°
63°
17
84°
60°
18
83°
61°
19
83°
59°
20
84°
60°
21
85°
64°
22
88°
67°
23
89°
66°
24
89°
66°
25
90°
64°
26
89°
63°
27
88°
64°
28
85°
63°
29
84°
60°
30
86°
57°
31
81°
54°
1
80°
55°
2
79°
57°
3
80°
59°
4
82°
58°
5
86°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in New Haven
New Haven's August 2026 forecast shows daily high temperatures ranging from 79° to 91°, with overnight lows between 54° and 70°. The average high for August is 86° 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 New Haven. See also: September | October | November.
