S
M
T
W
T
F
S
30
106°
82°
31
91°
75°
1
101°
80°
2
104°
86°
3
103°
86°
4
104°
85°
5
104°
86°
6
107°
86°
7
106°
86°
8
110°
87°
9
108°
88°
10
108°
86°
11
105°
83°
12
102°
84°
13
102°
86°
14
100°
82°
15
100°
81°
16
101°
84°
17
104°
85°
18
105°
83°
19
103°
82°
20
102°
81°
21
99°
76°
22
94°
72°
23
96°
74°
24
96°
74°
25
97°
75°
26
100°
79°
27
98°
75°
28
90°
69°
29
91°
72°
30
94°
67°
1
90°
67°
2
92°
70°
3
92°
68°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Phoenix
Phoenix's September 2026 forecast shows daily high temperatures ranging from 90° to 110°, with overnight lows between 67° and 88°. The average high for September is 99° with an average low of 78°. 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 Phoenix. See also: October | November | December.
