S
M
T
W
T
F
S
28
77°
60°
29
77°
59°
30
75°
60°
1
76°
59°
2
74°
56°
3
75°
57°
4
78°
60°
5
76°
57°
6
79°
59°
7
75°
58°
8
76°
57°
9
74°
57°
10
75°
56°
11
77°
57°
12
72°
57°
13
76°
58°
14
73°
59°
15
73°
57°
16
77°
57°
17
73°
56°
18
75°
58°
19
78°
61°
20
78°
61°
21
77°
60°
22
77°
61°
23
74°
58°
24
72°
59°
25
73°
58°
26
72°
58°
27
72°
59°
28
71°
57°
29
71°
57°
30
74°
56°
31
72°
58°
1
74°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
July Weather in Castro Valley
Castro Valley's July 2026 forecast shows daily high temperatures ranging from 71° to 79°, with overnight lows between 56° and 61°. The average high for July 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 July weather will actually feel in Castro Valley. See also: August | September | October.
