S
M
T
W
T
F
S
30
100°
80°
31
101°
79°
1
101°
79°
2
102°
80°
3
100°
80°
4
100°
77°
5
101°
77°
6
100°
79°
7
100°
76°
8
99°
77°
9
98°
78°
10
98°
76°
11
99°
77°
12
99°
76°
13
101°
76°
14
102°
74°
15
101°
74°
16
97°
75°
17
97°
75°
18
98°
73°
19
97°
77°
20
101°
77°
21
101°
78°
22
104°
80°
23
103°
80°
24
100°
78°
25
94°
73°
26
96°
74°
27
94°
73°
28
96°
74°
29
95°
73°
30
93°
73°
1
91°
71°
2
92°
70°
3
93°
72°
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 104°, with overnight lows between 70° and 80°. The average high for September is 98° with an average low of 76°. 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.
