S
M
T
W
T
F
S
29
93°
58°
30
81°
58°
31
70°
63°
1
74°
62°
2
69°
55°
3
81°
52°
4
93°
51°
5
89°
52°
6
81°
61°
7
82°
57°
8
85°
55°
9
81°
57°
10
82°
59°
11
76°
60°
12
71°
56°
13
66°
55°
14
75°
51°
15
79°
52°
16
78°
54°
17
80°
54°
18
83°
54°
19
82°
56°
20
80°
59°
21
77°
55°
22
74°
53°
23
78°
52°
24
76°
52°
25
71°
58°
26
69°
54°
27
71°
54°
28
77°
49°
29
79°
51°
30
68°
53°
1
73°
54°
2
71°
56°
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 68° to 73°, with overnight lows between 53° and 56°. The average high for April is 71° with an average low of 54°. 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.
