S
M
T
W
T
F
S
30
86°
68°
31
89°
67°
1
90°
65°
2
85°
61°
3
85°
62°
4
86°
65°
5
86°
64°
6
87°
66°
7
88°
62°
8
85°
62°
9
85°
59°
10
86°
60°
11
85°
61°
12
86°
64°
13
87°
61°
14
88°
60°
15
86°
67°
16
85°
66°
17
83°
67°
18
83°
66°
19
84°
66°
20
82°
65°
21
83°
66°
22
86°
66°
23
86°
65°
24
87°
66°
25
89°
65°
26
89°
65°
27
88°
62°
28
86°
61°
29
85°
63°
30
85°
64°
1
86°
65°
2
88°
64°
3
89°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in South El Monte
South El Monte's September 2026 forecast shows daily high temperatures ranging from 82° to 90°, with overnight lows between 59° and 68°. The average high for September is 86° with an average low of 64°. 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 South El Monte. See also: October | November | December.
