S
M
T
W
T
F
S
30
87°
66°
31
87°
66°
1
88°
68°
2
91°
68°
3
91°
69°
4
91°
70°
5
83°
69°
6
79°
62°
7
77°
58°
8
82°
61°
9
85°
68°
10
82°
61°
11
74°
57°
12
78°
63°
13
82°
62°
14
80°
55°
15
82°
61°
16
79°
58°
17
80°
57°
18
77°
54°
19
75°
59°
20
76°
58°
21
77°
59°
22
74°
58°
23
74°
57°
24
75°
57°
25
76°
56°
26
76°
57°
27
75°
57°
28
76°
58°
29
76°
57°
30
75°
56°
1
75°
56°
2
73°
52°
3
71°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in MacArthur
MacArthur's September 2026 forecast shows daily high temperatures ranging from 71° to 85°, with overnight lows between 47° and 68°. The average high for September is 77° with an average low of 58°. 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 MacArthur. See also: October | November | December.
