S
M
T
W
T
F
S
30
98°
77°
31
99°
76°
1
99°
75°
2
100°
74°
3
97°
75°
4
100°
77°
5
104°
79°
6
99°
74°
7
96°
72°
8
96°
70°
9
96°
72°
10
97°
73°
11
102°
72°
12
102°
72°
13
100°
77°
14
103°
77°
15
103°
74°
16
98°
72°
17
99°
73°
18
100°
77°
19
101°
72°
20
99°
72°
21
99°
76°
22
96°
74°
23
92°
71°
24
89°
74°
25
91°
73°
26
94°
72°
27
92°
73°
28
92°
75°
29
93°
74°
30
92°
74°
1
88°
73°
2
89°
69°
3
86°
68°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Fountain Hills
Fountain Hills's September 2026 forecast shows daily high temperatures ranging from 86° to 104°, with overnight lows between 68° and 79°. The average high for September is 97° 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 Fountain Hills. See also: October | November | December.
