S
M
T
W
T
F
S
30
92°
77°
31
93°
77°
1
92°
76°
2
90°
76°
3
90°
75°
4
91°
76°
5
88°
75°
6
87°
76°
7
88°
76°
8
90°
75°
9
91°
76°
10
91°
76°
11
92°
75°
12
92°
76°
13
91°
75°
14
92°
75°
15
91°
74°
16
91°
74°
17
90°
73°
18
91°
74°
19
90°
73°
20
88°
74°
21
89°
69°
22
87°
70°
23
89°
68°
24
90°
67°
25
88°
71°
26
87°
70°
27
88°
70°
28
88°
69°
29
87°
70°
30
85°
69°
1
89°
69°
2
89°
68°
3
88°
68°
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 85° to 93°, with overnight lows between 67° and 77°. The average high for September is 90° with an average low of 73°. 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.
