S
M
T
W
T
F
S
31
81°
46°
1
81°
50°
2
79°
54°
3
84°
52°
4
84°
57°
5
88°
59°
6
86°
63°
7
75°
52°
8
75°
45°
9
77°
46°
10
75°
55°
11
82°
57°
12
84°
52°
13
86°
54°
14
90°
59°
15
82°
57°
16
77°
61°
17
68°
59°
18
84°
62°
19
88°
57°
20
79°
63°
21
72°
64°
22
77°
63°
23
82°
63°
24
72°
63°
25
81°
66°
26
81°
63°
27
75°
64°
28
84°
63°
29
77°
61°
30
75°
58°
1
73°
47°
2
72°
44°
3
73°
46°
4
79°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Monrovia
Monrovia's September 2025 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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 Monrovia. See also: October | November | December.
