S
M
T
W
T
F
S
31
55°
36°
1
61°
37°
2
64°
43°
3
63°
48°
4
70°
50°
5
75°
50°
6
68°
55°
7
63°
48°
8
68°
49°
9
74°
49°
10
72°
54°
11
76°
54°
12
71°
53°
13
70°
54°
14
71°
55°
15
70°
52°
16
66°
50°
17
67°
53°
18
68°
53°
19
69°
52°
20
69°
50°
21
70°
50°
22
69°
51°
23
69°
51°
24
68°
57°
25
69°
57°
26
70°
58°
27
71°
57°
28
70°
56°
29
70°
54°
30
69°
53°
1
70°
53°
2
71°
56°
3
72°
59°
4
73°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
June Weather in Southwest Harbor
Southwest Harbor's June 2026 forecast shows daily high temperatures ranging from 63° to 76°, with overnight lows between 43° and 60°. The average high for June is 70° with an average low of 53°. 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 Southwest Harbor. See also: July | August | September.
