S
M
T
W
T
F
S
31
80°
58°
1
82°
61°
2
79°
62°
3
82°
61°
4
88°
65°
5
88°
66°
6
90°
66°
7
78°
63°
8
76°
59°
9
78°
58°
10
71°
62°
11
80°
66°
12
83°
64°
13
84°
63°
14
86°
67°
15
83°
67°
16
70°
61°
17
69°
61°
18
85°
65°
19
89°
65°
20
79°
67°
21
74°
65°
22
78°
62°
23
86°
64°
24
77°
69°
25
84°
72°
26
85°
70°
27
81°
67°
28
85°
67°
29
80°
67°
30
80°
70°
1
74°
59°
2
73°
57°
3
73°
54°
4
80°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Inner Harbor
Inner Harbor'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 Inner Harbor. See also: October | November | December.
