S
M
T
W
T
F
S
30
90°
67°
31
91°
67°
1
91°
66°
2
90°
67°
3
91°
67°
4
91°
66°
5
90°
66°
6
90°
61°
7
89°
57°
8
81°
61°
9
80°
63°
10
79°
64°
11
86°
63°
12
85°
65°
13
87°
61°
14
87°
54°
15
82°
55°
16
74°
54°
17
76°
53°
18
77°
58°
19
79°
51°
20
75°
51°
21
74°
54°
22
75°
58°
23
80°
58°
24
82°
60°
25
82°
60°
26
83°
58°
27
84°
59°
28
80°
55°
29
79°
54°
30
79°
54°
1
78°
53°
2
81°
56°
3
72°
45°
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 72° to 91°, with overnight lows between 45° and 67°. The average high for September is 83° with an average low of 59°. 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.
