S
M
T
W
T
F
S
30
83°
56°
31
82°
55°
1
77°
51°
2
77°
53°
3
86°
55°
4
87°
55°
5
86°
56°
6
85°
55°
7
85°
55°
8
84°
54°
9
85°
54°
10
85°
51°
11
84°
49°
12
79°
51°
13
85°
53°
14
87°
51°
15
84°
45°
16
74°
43°
17
70°
46°
18
78°
47°
19
74°
49°
20
77°
51°
21
84°
51°
22
84°
50°
23
82°
51°
24
82°
50°
25
83°
40°
26
81°
33°
27
67°
38°
28
65°
42°
29
74°
47°
30
76°
32°
1
76°
30°
2
62°
31°
3
60°
37°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Capitol
Capitol's September 2026 forecast shows daily high temperatures ranging from 60° to 87°, with overnight lows between 30° and 56°. The average high for September is 79° with an average low of 48°. 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 Capitol. See also: October | November | December.
