S
M
T
W
T
F
S
26
85°
66°
27
86°
65°
28
85°
67°
29
84°
60°
30
87°
59°
31
87°
61°
1
81°
67°
2
80°
63°
3
81°
60°
4
81°
57°
5
84°
56°
6
82°
69°
7
84°
67°
8
86°
65°
9
86°
59°
10
86°
69°
11
74°
63°
12
74°
62°
13
81°
62°
14
77°
68°
15
81°
70°
16
86°
72°
17
82°
63°
18
81°
58°
19
82°
62°
20
83°
64°
21
84°
60°
22
79°
60°
23
77°
55°
24
77°
51°
25
78°
50°
26
82°
56°
27
82°
62°
28
82°
56°
29
82°
64°
30
86°
65°
31
89°
69°
1
90°
69°
2
91°
68°
3
90°
68°
4
85°
63°
5
84°
62°
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 82° to 91°, with overnight lows between 56° and 69°. The average high for August is 87° with an average low of 65°. 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.
