S
M
T
W
T
F
S
29
83°
48°
30
88°
64°
31
90°
68°
1
92°
71°
2
87°
66°
3
84°
72°
4
79°
58°
5
62°
52°
6
74°
48°
7
77°
46°
8
83°
53°
9
85°
64°
10
81°
63°
11
84°
68°
12
79°
70°
13
89°
71°
14
88°
71°
15
85°
70°
16
88°
68°
17
89°
68°
18
74°
49°
19
69°
49°
20
61°
53°
21
64°
59°
22
85°
64°
23
83°
68°
24
90°
72°
25
91°
73°
26
89°
70°
27
89°
75°
28
92°
73°
29
80°
66°
30
73°
62°
1
67°
51°
2
68°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
April Weather in San Marcos
San Marcos's April 2026 forecast shows daily high temperatures ranging from 67° to 92°, with overnight lows between 49° and 73°. The average high for April is 76° with an average low of 60°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how April weather will actually feel in San Marcos. See also: May | June | July.
