S
M
T
W
T
F
S
30
83°
59°
31
80°
69°
1
90°
70°
2
79°
71°
3
88°
72°
4
90°
74°
5
81°
67°
6
78°
66°
7
80°
61°
8
83°
61°
9
86°
66°
10
88°
74°
11
79°
63°
12
80°
60°
13
86°
73°
14
78°
58°
15
73°
54°
16
78°
54°
17
84°
70°
18
85°
65°
19
76°
62°
20
79°
69°
21
76°
62°
22
65°
62°
23
69°
59°
24
64°
54°
25
69°
54°
26
64°
56°
27
63°
58°
28
68°
55°
29
74°
56°
30
77°
59°
1
81°
58°
2
77°
57°
3
75°
58°
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 63° to 81°, with overnight lows between 54° and 59°. The average high for September is 71° with an average low of 57°. 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.
