S
M
T
W
T
F
S
30
99°
73°
31
100°
74°
1
103°
76°
2
102°
76°
3
101°
71°
4
97°
69°
5
98°
72°
6
97°
73°
7
101°
69°
8
98°
67°
9
98°
67°
10
97°
68°
11
97°
66°
12
98°
67°
13
99°
66°
14
100°
66°
15
99°
70°
16
101°
70°
17
99°
71°
18
97°
71°
19
99°
72°
20
102°
70°
21
102°
68°
22
94°
68°
23
95°
71°
24
99°
70°
25
100°
68°
26
99°
71°
27
100°
71°
28
101°
72°
29
101°
70°
30
100°
69°
1
98°
67°
2
99°
66°
3
98°
67°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Tempe
Tempe's September 2026 forecast shows daily high temperatures ranging from 94° to 103°, with overnight lows between 66° and 76°. The average high for September is 99° with an average low of 70°. 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 Tempe. See also: October | November | December.
