S
M
T
W
T
F
S
28
77°
62°
29
80°
63°
30
81°
63°
1
81°
64°
2
84°
62°
3
89°
62°
4
93°
63°
5
89°
65°
6
80°
61°
7
80°
59°
8
79°
59°
9
81°
60°
10
80°
60°
11
85°
65°
12
84°
66°
13
87°
67°
14
89°
69°
15
93°
69°
16
93°
70°
17
92°
68°
18
93°
70°
19
88°
65°
20
87°
67°
21
89°
68°
22
89°
69°
23
90°
69°
24
90°
68°
25
89°
69°
26
89°
69°
27
88°
68°
28
89°
68°
29
89°
69°
30
90°
69°
31
90°
68°
1
88°
68°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
July Weather in San Marcos
San Marcos's July 2026 forecast shows daily high temperatures ranging from 79° to 93°, with overnight lows between 59° and 70°. The average high for July is 87° with an average low of 67°. 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 San Marcos. See also: August | September | October.
