S
M
T
W
T
F
S
30
89°
70°
31
85°
65°
1
85°
63°
2
82°
63°
3
80°
64°
4
82°
63°
5
89°
63°
6
76°
66°
7
93°
73°
8
92°
76°
9
107°
81°
10
94°
75°
11
92°
72°
12
88°
69°
13
86°
67°
14
84°
66°
15
83°
67°
16
84°
68°
17
86°
67°
18
85°
68°
19
86°
69°
20
85°
68°
21
84°
68°
22
83°
66°
23
84°
67°
24
82°
63°
25
77°
62°
26
84°
64°
27
84°
65°
28
81°
61°
29
83°
63°
30
84°
66°
1
85°
66°
2
85°
65°
3
84°
66°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Downey
Downey's September 2026 forecast shows daily high temperatures ranging from 77° to 92°, with overnight lows between 61° and 72°. The average high for September is 84° with an average low of 66°. 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 Downey. See also: October | November | December.
