S
M
T
W
T
F
S
30
98°
75°
31
99°
75°
1
99°
76°
2
98°
76°
3
98°
74°
4
98°
75°
5
99°
76°
6
97°
75°
7
93°
74°
8
97°
74°
9
98°
71°
10
90°
69°
11
84°
64°
12
84°
63°
13
85°
64°
14
83°
65°
15
84°
64°
16
84°
65°
17
83°
66°
18
84°
66°
19
84°
65°
20
83°
65°
21
83°
64°
22
82°
65°
23
82°
64°
24
81°
63°
25
81°
63°
26
80°
61°
27
81°
62°
28
81°
62°
29
80°
61°
30
81°
62°
1
80°
61°
2
79°
61°
3
79°
60°
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 79° to 99°, with overnight lows between 60° and 76°. The average high for September is 87° with an average low of 67°. 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.
