S
M
T
W
T
F
S
31
59°
47°
1
60°
46°
2
62°
47°
3
64°
50°
4
64°
50°
5
65°
48°
6
67°
50°
7
67°
50°
8
66°
52°
9
67°
52°
10
68°
50°
11
67°
49°
12
68°
53°
13
67°
52°
14
66°
54°
15
67°
52°
16
68°
52°
17
68°
54°
18
69°
54°
19
69°
53°
20
67°
51°
21
65°
49°
22
65°
53°
23
68°
53°
24
64°
51°
25
64°
51°
26
65°
53°
27
64°
55°
28
65°
52°
29
67°
55°
30
67°
55°
1
68°
54°
2
68°
55°
3
69°
54°
4
68°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
June Weather in Portsmouth
Portsmouth's June 2026 forecast shows daily high temperatures ranging from 59° to 69°, with overnight lows between 46° and 55°. The average high for June is 66° with an average low of 52°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how June weather will actually feel in Portsmouth. See also: July | August | September.
