S
M
T
W
T
F
S
30
85°
67°
31
84°
67°
1
85°
66°
2
79°
62°
3
78°
61°
4
78°
62°
5
77°
60°
6
79°
64°
7
82°
65°
8
81°
65°
9
80°
64°
10
83°
65°
11
84°
65°
12
83°
64°
13
84°
66°
14
83°
58°
15
77°
56°
16
75°
57°
17
74°
56°
18
74°
54°
19
73°
53°
20
74°
53°
21
76°
55°
22
78°
59°
23
79°
52°
24
80°
53°
25
72°
51°
26
73°
52°
27
74°
57°
28
76°
58°
29
77°
50°
30
73°
52°
1
70°
57°
2
71°
56°
3
74°
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 70° to 85°, with overnight lows between 50° and 67°. The average high for September is 78° 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.
