S
M
T
W
T
F
S
31
89°
79°
1
87°
78°
2
88°
74°
3
84°
78°
4
88°
78°
5
87°
79°
6
88°
78°
7
87°
78°
8
88°
79°
9
88°
77°
10
89°
78°
11
89°
79°
12
88°
79°
13
88°
80°
14
88°
79°
15
88°
78°
16
88°
77°
17
85°
76°
18
87°
74°
19
86°
73°
20
85°
76°
21
86°
74°
22
86°
80°
23
89°
79°
24
89°
79°
25
89°
78°
26
89°
77°
27
88°
77°
28
88°
75°
29
89°
77°
30
88°
80°
1
89°
79°
2
89°
79°
3
88°
77°
4
86°
76°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Capitol Hill
Capitol Hill's September 2025 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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 Hill. See also: October | November | December.
