S
M
T
W
T
F
S
28
79°
60°
29
80°
60°
30
83°
59°
1
92°
71°
2
97°
71°
3
96°
78°
4
91°
74°
5
83°
63°
6
80°
64°
7
70°
64°
8
76°
63°
9
90°
70°
10
86°
67°
11
82°
61°
12
80°
58°
13
86°
64°
14
90°
70°
15
92°
65°
16
83°
61°
17
83°
61°
18
80°
62°
19
78°
61°
20
79°
62°
21
80°
60°
22
77°
57°
23
77°
58°
24
77°
60°
25
77°
59°
26
78°
63°
27
82°
64°
28
77°
64°
29
78°
63°
30
81°
64°
31
81°
64°
1
80°
63°
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 76° to 92°, with overnight lows between 57° and 70°. The average high for July 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 July weather will actually feel in Portsmouth. See also: August | September | October.
