S
M
T
W
T
F
S
30
88°
60°
31
81°
58°
1
80°
60°
2
80°
63°
3
81°
59°
4
83°
65°
5
86°
65°
6
87°
58°
7
84°
59°
8
79°
57°
9
79°
56°
10
78°
62°
11
82°
56°
12
80°
56°
13
77°
55°
14
76°
62°
15
80°
61°
16
83°
53°
17
83°
52°
18
74°
52°
19
73°
53°
20
74°
56°
21
73°
54°
22
73°
52°
23
72°
57°
24
72°
56°
25
73°
57°
26
78°
57°
27
78°
51°
28
79°
49°
29
71°
51°
30
70°
54°
1
71°
56°
2
75°
53°
3
76°
47°
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 70° to 88°, with overnight lows between 47° and 65°. The average high for September is 78° with an average low of 56°. 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.
