S
M
T
W
T
F
S
30
101°
81°
31
102°
82°
1
105°
83°
2
104°
84°
3
102°
79°
4
99°
77°
5
100°
80°
6
99°
81°
7
102°
78°
8
100°
75°
9
99°
76°
10
100°
75°
11
98°
75°
12
99°
76°
13
100°
75°
14
101°
74°
15
100°
78°
16
102°
78°
17
100°
79°
18
97°
79°
19
100°
80°
20
103°
78°
21
102°
76°
22
95°
76°
23
96°
79°
24
99°
77°
25
100°
76°
26
100°
78°
27
101°
78°
28
101°
79°
29
99°
77°
30
100°
76°
1
98°
74°
2
99°
73°
3
98°
74°
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 95° to 105°, with overnight lows between 73° and 84°. The average high for September is 100° 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.
