S
M
T
W
T
F
S
30
104°
85°
31
105°
85°
1
106°
84°
2
106°
83°
3
100°
83°
4
103°
82°
5
103°
87°
6
102°
87°
7
103°
83°
8
102°
80°
9
105°
86°
10
105°
79°
11
100°
82°
12
102°
76°
13
97°
74°
14
96°
73°
15
96°
73°
16
96°
74°
17
97°
74°
18
98°
83°
19
103°
78°
20
100°
77°
21
97°
74°
22
96°
75°
23
96°
72°
24
97°
73°
25
96°
80°
26
99°
80°
27
98°
76°
28
96°
71°
29
95°
72°
30
96°
69°
1
95°
68°
2
91°
67°
3
91°
67°
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 91° to 106°, with overnight lows between 67° and 87°. The average high for September is 99° with an average low of 77°. 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.
