S
M
T
W
T
F
S
30
100°
77°
31
100°
78°
1
103°
81°
2
102°
80°
3
101°
77°
4
98°
75°
5
97°
77°
6
97°
78°
7
101°
73°
8
98°
70°
9
97°
72°
10
98°
71°
11
96°
70°
12
97°
71°
13
98°
70°
14
99°
70°
15
99°
75°
16
101°
74°
17
98°
74°
18
95°
75°
19
99°
76°
20
102°
75°
21
101°
72°
22
93°
72°
23
95°
74°
24
98°
72°
25
98°
71°
26
99°
73°
27
99°
74°
28
98°
74°
29
100°
71°
30
99°
72°
1
96°
70°
2
95°
69°
3
96°
69°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Surprise
Surprise's September 2026 forecast shows daily high temperatures ranging from 93° to 103°, with overnight lows between 69° and 81°. The average high for September is 98° with an average low of 73°. 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 Surprise. See also: October | November | December.
