S
M
T
W
T
F
S
28
83°
73°
29
80°
71°
30
84°
68°
1
91°
72°
2
95°
75°
3
98°
77°
4
101°
80°
5
98°
77°
6
94°
78°
7
89°
74°
8
81°
73°
9
92°
71°
10
93°
75°
11
88°
74°
12
84°
69°
13
84°
67°
14
87°
69°
15
94°
74°
16
94°
75°
17
93°
76°
18
90°
77°
19
87°
73°
20
90°
75°
21
88°
73°
22
87°
74°
23
86°
70°
24
90°
73°
25
85°
71°
26
84°
70°
27
85°
70°
28
85°
72°
29
86°
73°
30
87°
74°
31
86°
73°
1
85°
73°
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 84° to 94°, with overnight lows between 67° and 77°. The average high for July is 88° with an average low of 73°. 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.
