S
M
T
W
T
F
S
28
72°
56°
29
70°
54°
30
70°
58°
1
72°
53°
2
70°
53°
3
71°
54°
4
71°
55°
5
73°
57°
6
77°
56°
7
75°
55°
8
79°
57°
9
80°
58°
10
75°
55°
11
76°
56°
12
78°
57°
13
77°
54°
14
75°
55°
15
76°
58°
16
78°
60°
17
81°
62°
18
82°
60°
19
79°
58°
20
81°
59°
21
79°
61°
22
81°
61°
23
81°
60°
24
79°
60°
25
80°
61°
26
76°
59°
27
75°
61°
28
82°
61°
29
81°
62°
30
82°
61°
31
81°
60°
1
81°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
July Weather in Southwest Harbor
Southwest Harbor's July 2026 forecast shows daily high temperatures ranging from 70° to 82°, with overnight lows between 53° and 62°. The average high for July is 77° with an average low of 58°. 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 Southwest Harbor. See also: August | September | October.
