S
M
T
W
T
F
S
30
88°
68°
31
88°
68°
1
89°
67°
2
89°
67°
3
88°
66°
4
88°
67°
5
86°
67°
6
88°
66°
7
88°
66°
8
89°
67°
9
89°
67°
10
88°
66°
11
88°
67°
12
87°
66°
13
88°
67°
14
86°
63°
15
85°
62°
16
84°
62°
17
85°
61°
18
86°
54°
19
76°
53°
20
76°
55°
21
81°
54°
22
82°
55°
23
83°
58°
24
82°
58°
25
80°
59°
26
82°
58°
27
78°
58°
28
80°
57°
29
78°
51°
30
73°
52°
1
79°
55°
2
81°
54°
3
80°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Pomona
Pomona's September 2026 forecast shows daily high temperatures ranging from 73° to 89°, with overnight lows between 51° and 68°. The average high for September is 84° with an average low of 61°. 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 Pomona. See also: October | November | December.
