S
M
T
W
T
F
S
31
84°
46°
1
81°
53°
2
74°
54°
3
76°
55°
4
77°
53°
5
78°
54°
6
71°
52°
7
76°
54°
8
78°
55°
9
79°
57°
10
78°
58°
11
77°
57°
12
76°
58°
13
77°
57°
14
74°
55°
15
75°
58°
16
78°
59°
17
78°
58°
18
77°
56°
19
77°
55°
20
74°
55°
21
77°
56°
22
77°
55°
23
75°
58°
24
77°
56°
25
76°
56°
26
72°
57°
27
72°
56°
28
76°
57°
29
78°
57°
30
77°
58°
1
77°
58°
2
75°
59°
3
77°
60°
4
76°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
June Weather in Castro Valley
Castro Valley's June 2026 forecast shows daily high temperatures ranging from 71° to 81°, with overnight lows between 52° and 60°. The average high for June is 76° with an average low of 56°. 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 Castro Valley. See also: July | August | September.
