S
M
T
W
T
F
S
31
55°
36°
1
61°
37°
2
70°
42°
3
67°
46°
4
75°
50°
5
80°
50°
6
60°
51°
7
61°
48°
8
78°
43°
9
81°
49°
10
83°
54°
11
77°
56°
12
73°
55°
13
76°
54°
14
74°
53°
15
74°
59°
16
75°
55°
17
76°
50°
18
60°
50°
19
75°
57°
20
69°
57°
21
74°
52°
22
68°
52°
23
66°
55°
24
79°
56°
25
77°
56°
26
61°
56°
27
71°
56°
28
77°
55°
29
80°
56°
30
78°
57°
1
79°
61°
2
89°
67°
3
85°
67°
4
80°
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 80° to 89°, with overnight lows between 60° and 67°. The average high for June is 85° with an average low of 65°. 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.
