S
M
T
W
T
F
S
30
71°
48°
31
70°
47°
1
70°
49°
2
70°
49°
3
71°
50°
4
68°
49°
5
70°
48°
6
68°
49°
7
68°
48°
8
69°
46°
9
67°
49°
10
69°
47°
11
67°
45°
12
66°
44°
13
69°
45°
14
69°
51°
15
70°
51°
16
73°
50°
17
72°
47°
18
71°
44°
19
72°
50°
20
72°
45°
21
67°
43°
22
67°
46°
23
66°
47°
24
65°
48°
25
63°
45°
26
68°
40°
27
68°
40°
28
60°
41°
29
59°
41°
30
58°
38°
1
Hist. Avg.
66°
47°
2
Hist. Avg.
66°
47°
3
Hist. Avg.
66°
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 58° to 73°, with overnight lows between 38° and 51°. The average high for September is 68° with an average low of 46°. 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.
