S
M
T
W
T
F
S
30
90°
71°
31
92°
69°
1
87°
65°
2
85°
63°
3
82°
60°
4
82°
65°
5
94°
63°
6
90°
77°
7
104°
76°
8
101°
78°
9
104°
74°
10
98°
69°
11
91°
68°
12
85°
67°
13
84°
63°
14
86°
64°
15
87°
63°
16
88°
65°
17
87°
64°
18
89°
66°
19
88°
64°
20
87°
62°
21
86°
62°
22
86°
61°
23
81°
61°
24
81°
60°
25
81°
61°
26
87°
64°
27
87°
62°
28
84°
60°
29
85°
62°
30
87°
63°
1
87°
64°
2
86°
64°
3
87°
63°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Casa de Oro-Mount Helix
Casa de Oro-Mount Helix's September 2026 forecast shows daily high temperatures ranging from 81° to 104°, with overnight lows between 60° and 74°. The average high for September is 87° with an average low of 64°. 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 Casa de Oro-Mount Helix. See also: October | November | December.
