S
M
T
W
T
F
S
31
84°
46°
1
88°
49°
2
77°
52°
3
68°
53°
4
79°
53°
5
84°
50°
6
65°
51°
7
76°
48°
8
70°
49°
9
75°
57°
10
82°
51°
11
100°
58°
12
93°
56°
13
77°
52°
14
79°
56°
15
79°
56°
16
76°
56°
17
71°
58°
18
77°
57°
19
74°
58°
20
73°
55°
21
74°
55°
22
75°
57°
23
77°
55°
24
76°
59°
25
74°
58°
26
73°
57°
27
72°
59°
28
77°
60°
29
79°
59°
30
78°
60°
1
76°
59°
2
74°
57°
3
75°
57°
4
78°
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 72° to 79°, with overnight lows between 55° and 60°. The average high for June is 75° 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 June weather will actually feel in Castro Valley. See also: July | August | September.
