S
M
T
W
T
F
S
30
99°
64°
31
100°
68°
1
101°
72°
2
100°
72°
3
100°
73°
4
101°
74°
5
103°
73°
6
103°
75°
7
100°
73°
8
104°
69°
9
103°
75°
10
98°
73°
11
86°
70°
12
98°
70°
13
97°
71°
14
96°
73°
15
98°
73°
16
98°
76°
17
98°
74°
18
98°
70°
19
98°
68°
20
97°
66°
21
93°
72°
22
88°
69°
23
87°
68°
24
82°
58°
25
86°
57°
26
85°
61°
27
79°
63°
28
87°
61°
29
92°
57°
30
94°
65°
1
77°
66°
2
71°
59°
3
69°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Simpson
Simpson's September 2026 forecast shows daily high temperatures ranging from 69° to 77°, with overnight lows between 58° and 66°. The average high for September is 72° with an average low of 61°. 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 Simpson. See also: October | November | December.
