S
M
T
W
T
F
S
31
65°
49°
1
64°
50°
2
61°
43°
3
62°
46°
4
65°
43°
5
66°
51°
6
67°
49°
7
63°
50°
8
63°
50°
9
64°
43°
10
63°
44°
11
64°
45°
12
64°
49°
13
72°
47°
14
72°
53°
15
71°
46°
16
64°
46°
17
65°
47°
18
68°
52°
19
65°
45°
20
65°
49°
21
72°
51°
22
74°
54°
23
75°
46°
24
75°
47°
25
74°
47°
26
74°
45°
27
73°
46°
28
74°
47°
29
74°
48°
30
73°
44°
1
73°
44°
2
72°
45°
3
71°
45°
4
74°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
June Weather in San Juan Island
San Juan Island's June 2026 forecast shows daily high temperatures ranging from 61° to 75°, with overnight lows between 43° and 54°. The average high for June is 69° with an average low of 47°. 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 San Juan Island. See also: July | August | September.
