S
M
T
W
T
F
S
28
77°
60°
29
79°
59°
30
78°
60°
1
76°
59°
2
74°
57°
3
75°
57°
4
78°
60°
5
76°
57°
6
71°
55°
7
70°
55°
8
70°
56°
9
71°
56°
10
73°
57°
11
76°
58°
12
72°
57°
13
72°
57°
14
73°
58°
15
74°
58°
16
77°
60°
17
77°
60°
18
73°
59°
19
74°
60°
20
74°
60°
21
75°
59°
22
73°
59°
23
72°
58°
24
73°
59°
25
77°
60°
26
78°
61°
27
76°
61°
28
78°
60°
29
77°
59°
30
76°
58°
31
76°
57°
1
76°
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 70° to 79°, with overnight lows between 55° 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.
