S
M
T
W
T
F
S
30
79°
65°
31
86°
69°
1
90°
72°
2
93°
74°
3
89°
69°
4
82°
65°
5
78°
58°
6
76°
58°
7
76°
58°
8
73°
57°
9
74°
58°
10
76°
59°
11
74°
56°
12
75°
55°
13
71°
57°
14
73°
55°
15
77°
60°
16
75°
59°
17
76°
56°
18
71°
52°
19
74°
57°
20
78°
59°
21
78°
59°
22
77°
58°
23
78°
58°
24
78°
57°
25
77°
56°
26
77°
55°
27
76°
56°
28
76°
56°
29
75°
55°
30
73°
53°
1
72°
54°
2
73°
54°
3
74°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Louisville
Louisville's September 2026 forecast shows daily high temperatures ranging from 71° to 93°, with overnight lows between 52° and 74°. 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 Louisville. See also: October | November | December.
