S
M
T
W
T
F
S
28
90°
68°
29
88°
70°
30
86°
71°
1
85°
70°
2
86°
69°
3
85°
72°
4
91°
73°
5
91°
71°
6
90°
72°
7
89°
72°
8
90°
71°
9
89°
70°
10
89°
72°
11
88°
71°
12
90°
70°
13
88°
70°
14
88°
71°
15
89°
70°
16
90°
71°
17
90°
72°
18
92°
71°
19
90°
70°
20
89°
68°
21
86°
67°
22
86°
72°
23
86°
72°
24
88°
71°
25
Hist. Avg.
89°
73°
26
Hist. Avg.
89°
73°
27
Hist. Avg.
88°
73°
28
Hist. Avg.
88°
73°
29
Hist. Avg.
88°
73°
30
Hist. Avg.
88°
73°
31
Hist. Avg.
88°
72°
1
Hist. Avg.
88°
72°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
July Weather in Portsmouth
Portsmouth's July 2026 forecast shows daily high temperatures ranging from 85° to 92°, with overnight lows between 67° and 73°. The average high for July is 88° with an average low of 71°. 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.
