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°
90°
12
104°
85°
13
105°
86°
14
105°
85°
15
102°
83°
16
95°
73°
17
90°
75°
18
102°
79°
19
103°
79°
20
104°
79°
21
102°
82°
22
100°
80°
23
99°
84°
24
88°
76°
25
95°
74°
26
100°
79°
27
95°
73°
28
85°
71°
29
83°
69°
30
87°
71°
1
92°
76°
2
96°
77°
3
99°
78°
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 83° to 100°, with overnight lows between 69° and 79°. The average high for September is 92° with an average low of 74°. 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.
