S
M
T
W
T
F
S
30
89°
55°
31
88°
53°
1
88°
51°
2
85°
54°
3
84°
51°
4
87°
49°
5
81°
46°
6
80°
46°
7
79°
47°
8
79°
49°
9
78°
47°
10
77°
45°
11
78°
50°
12
83°
51°
13
85°
43°
14
77°
42°
15
75°
42°
16
74°
43°
17
75°
43°
18
77°
42°
19
78°
44°
20
75°
46°
21
81°
47°
22
82°
48°
23
82°
49°
24
81°
49°
25
82°
48°
26
81°
48°
27
82°
46°
28
79°
46°
29
74°
45°
30
71°
45°
1
70°
43°
2
70°
44°
3
73°
34°
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 89°, with overnight lows between 34° and 55°. The average high for September is 79° with an average low of 47°. 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.
