S
M
T
W
T
F
S
30
84°
72°
31
85°
73°
1
84°
72°
2
84°
72°
3
85°
73°
4
85°
73°
5
84°
74°
6
85°
73°
7
84°
72°
8
83°
73°
9
84°
74°
10
84°
73°
11
83°
73°
12
84°
74°
13
84°
73°
14
82°
73°
15
82°
74°
16
84°
73°
17
83°
73°
18
82°
72°
19
82°
72°
20
83°
73°
21
82°
72°
22
83°
73°
23
82°
72°
24
83°
73°
25
83°
73°
26
84°
71°
27
82°
73°
28
82°
72°
29
Hist. Avg.
88°
75°
30
Hist. Avg.
88°
75°
1
Hist. Avg.
88°
75°
2
Hist. Avg.
88°
75°
3
Hist. Avg.
88°
75°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in San Marcelino
San Marcelino's September 2026 forecast shows daily high temperatures ranging from 82° to 85°, with overnight lows between 71° and 74°. The average high for September is 83° with an average low of 73°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in San Marcelino. See also: October | November | December.
