S
M
T
W
T
F
S
27
81°
63°
28
80°
64°
29
84°
61°
30
81°
60°
1
79°
61°
2
79°
63°
3
86°
63°
4
85°
58°
5
80°
61°
6
Hist. Avg.
82°
60°
7
Hist. Avg.
82°
60°
8
Hist. Avg.
82°
59°
9
Hist. Avg.
82°
59°
10
Hist. Avg.
82°
59°
11
Hist. Avg.
82°
59°
12
Hist. Avg.
81°
58°
13
Hist. Avg.
81°
58°
14
Hist. Avg.
81°
58°
15
Hist. Avg.
81°
58°
16
Hist. Avg.
81°
57°
17
Hist. Avg.
80°
57°
18
Hist. Avg.
80°
57°
19
Hist. Avg.
80°
57°
20
Hist. Avg.
80°
56°
21
Hist. Avg.
80°
56°
22
Hist. Avg.
80°
56°
23
Hist. Avg.
80°
56°
24
Hist. Avg.
80°
55°
25
Hist. Avg.
79°
55°
26
Hist. Avg.
79°
55°
27
Hist. Avg.
79°
55°
28
Hist. Avg.
79°
54°
29
Hist. Avg.
79°
54°
30
Hist. Avg.
79°
54°
31
Hist. Avg.
78°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
October Weather in San Marcos
San Marcos's October 2026 forecast shows daily high temperatures ranging from 79° to 86°, with overnight lows between 58° and 64°. The average high for October is 82° with an average low of 62°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how October weather will actually feel in San Marcos. See also: November | December | January.
