S
M
T
W
T
F
S
28
75°
54°
29
70°
46°
30
72°
57°
1
77°
54°
2
79°
59°
3
75°
48°
4
81°
57°
5
82°
59°
6
86°
55°
7
86°
52°
8
88°
59°
9
90°
57°
10
91°
61°
11
90°
63°
12
87°
59°
13
82°
62°
14
85°
66°
15
82°
65°
16
79°
64°
17
77°
62°
18
75°
60°
19
73°
58°
20
74°
57°
21
75°
60°
22
75°
60°
23
76°
62°
24
69°
56°
25
68°
58°
26
67°
57°
27
67°
55°
28
68°
56°
29
70°
57°
30
72°
57°
31
72°
56°
1
73°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
July Weather in Portsmouth
Portsmouth's July 2026 forecast shows daily high temperatures ranging from 67° to 90°, with overnight lows between 55° and 66°. The average high for July is 75° with an average low of 59°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how July weather will actually feel in Portsmouth. See also: August | September | October.
