S
M
T
W
T
F
S
27
75°
45°
28
76°
45°
29
78°
46°
30
82°
49°
1
87°
57°
2
77°
59°
3
72°
53°
4
76°
49°
5
71°
40°
6
69°
40°
7
78°
47°
8
80°
52°
9
81°
52°
10
79°
55°
11
81°
58°
12
76°
59°
13
74°
49°
14
72°
50°
15
74°
49°
16
73°
43°
17
73°
48°
18
72°
48°
19
62°
40°
20
65°
44°
21
61°
47°
22
61°
41°
23
62°
43°
24
62°
38°
25
57°
37°
26
58°
40°
27
57°
34°
28
57°
35°
29
62°
43°
30
67°
45°
31
69°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
October Weather in Portsmouth
Portsmouth's October 2026 forecast shows daily high temperatures ranging from 57° to 81°, with overnight lows between 34° and 59°. The average high for October is 69° with an average low of 46°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how October weather will actually feel in Portsmouth. See also: November | December | January.
