S
M
T
W
T
F
S
30
98°
75°
31
99°
75°
1
98°
71°
2
99°
74°
3
97°
74°
4
97°
72°
5
100°
71°
6
100°
75°
7
94°
74°
8
99°
75°
9
89°
73°
10
83°
69°
11
84°
61°
12
83°
65°
13
79°
64°
14
94°
66°
15
93°
71°
16
92°
70°
17
94°
75°
18
94°
72°
19
92°
72°
20
76°
68°
21
73°
65°
22
75°
62°
23
75°
60°
24
75°
56°
25
66°
59°
26
73°
63°
27
77°
64°
28
78°
62°
29
79°
62°
30
79°
68°
1
71°
55°
2
71°
49°
3
72°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Olathe
Olathe's September 2026 forecast shows daily high temperatures ranging from 71° to 72°, with overnight lows between 49° and 55°. The average high for September is 71° with an average low of 53°. 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 Olathe. See also: October | November | December.
