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
108°
88°
9
107°
92°
10
109°
88°
11
106°
85°
12
104°
87°
13
104°
85°
14
104°
82°
15
100°
84°
16
101°
84°
17
104°
85°
18
108°
84°
19
106°
83°
20
103°
82°
21
100°
80°
22
100°
80°
23
102°
81°
24
96°
74°
25
92°
70°
26
97°
78°
27
99°
78°
28
94°
77°
29
93°
76°
30
98°
76°
1
99°
75°
2
99°
76°
3
98°
76°
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 92° to 108°, with overnight lows between 70° and 87°. The average high for September is 100° with an average low of 80°. 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.
