S
M
T
W
T
F
S
30
90°
68°
31
88°
61°
1
85°
64°
2
80°
67°
3
87°
69°
4
90°
70°
5
86°
70°
6
88°
66°
7
79°
64°
8
80°
63°
9
80°
56°
10
75°
56°
11
75°
54°
12
79°
60°
13
77°
60°
14
79°
59°
15
79°
59°
16
77°
56°
17
78°
59°
18
78°
59°
19
77°
57°
20
76°
57°
21
78°
59°
22
78°
59°
23
77°
58°
24
78°
58°
25
77°
57°
26
77°
57°
27
78°
56°
28
77°
56°
29
76°
55°
30
76°
57°
1
75°
56°
2
76°
55°
3
75°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Lafayette
Lafayette's September 2026 forecast shows daily high temperatures ranging from 75° to 90°, with overnight lows between 53° and 70°. The average high for September is 79° 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 Lafayette. See also: October | November | December.
