S
M
T
W
T
F
S
30
74°
44°
31
74°
50°
1
80°
42°
2
80°
40°
3
73°
40°
4
74°
41°
5
80°
47°
6
80°
46°
7
79°
45°
8
77°
40°
9
74°
40°
10
76°
43°
11
79°
46°
12
80°
43°
13
81°
43°
14
79°
46°
15
81°
47°
16
80°
45°
17
76°
42°
18
73°
40°
19
69°
41°
20
77°
41°
21
77°
42°
22
76°
43°
23
76°
44°
24
75°
43°
25
75°
42°
26
71°
42°
27
75°
41°
28
75°
41°
29
74°
42°
30
74°
41°
1
73°
40°
2
74°
36°
3
65°
34°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Casa Grande
Casa Grande's September 2026 forecast shows daily high temperatures ranging from 65° to 81°, with overnight lows between 34° and 50°. The average high for September is 76° with an average low of 42°. 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 Casa Grande. See also: October | November | December.
