S
M
T
W
T
F
S
30
94°
69°
31
95°
74°
1
97°
74°
2
98°
77°
3
99°
77°
4
100°
78°
5
96°
76°
6
87°
70°
7
87°
62°
8
92°
71°
9
95°
77°
10
80°
74°
11
82°
72°
12
88°
74°
13
93°
71°
14
83°
62°
15
96°
65°
16
95°
78°
17
97°
78°
18
93°
73°
19
96°
71°
20
97°
70°
21
81°
62°
22
75°
60°
23
72°
59°
24
74°
58°
25
76°
53°
26
74°
56°
27
78°
56°
28
78°
58°
29
81°
61°
30
77°
61°
1
77°
58°
2
79°
56°
3
77°
62°
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 72° to 97°, with overnight lows between 53° and 70°. The average high for September is 78° with an average low of 59°. 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.
