S
M
T
W
T
F
S
28
79°
55°
29
75°
56°
30
74°
54°
1
74°
51°
2
73°
54°
3
72°
58°
4
74°
56°
5
77°
58°
6
78°
60°
7
78°
58°
8
79°
59°
9
79°
56°
10
Hist. Avg.
75°
57°
11
Hist. Avg.
75°
57°
12
Hist. Avg.
75°
57°
13
Hist. Avg.
75°
57°
14
Hist. Avg.
75°
57°
15
Hist. Avg.
75°
57°
16
Hist. Avg.
74°
58°
17
Hist. Avg.
74°
58°
18
Hist. Avg.
74°
58°
19
Hist. Avg.
74°
58°
20
Hist. Avg.
74°
58°
21
Hist. Avg.
74°
58°
22
Hist. Avg.
74°
58°
23
Hist. Avg.
74°
58°
24
Hist. Avg.
74°
58°
25
Hist. Avg.
74°
58°
26
Hist. Avg.
74°
58°
27
Hist. Avg.
75°
58°
28
Hist. Avg.
75°
58°
29
Hist. Avg.
75°
58°
30
Hist. Avg.
75°
58°
31
Hist. Avg.
75°
58°
1
Hist. Avg.
75°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
July Weather in Castro Valley
Castro Valley's July 2026 forecast shows daily high temperatures ranging from 72° to 79°, with overnight lows between 51° and 60°. The average high for July 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 July weather will actually feel in Castro Valley. See also: August | September | October.
