S
M
T
W
T
F
S
30
82°
57°
31
73°
57°
1
85°
52°
2
85°
59°
3
87°
54°
4
89°
60°
5
87°
60°
6
88°
59°
7
87°
58°
8
88°
60°
9
86°
53°
10
86°
50°
11
86°
51°
12
87°
59°
13
90°
60°
14
77°
59°
15
76°
53°
16
80°
57°
17
66°
57°
18
78°
55°
19
75°
55°
20
74°
48°
21
78°
46°
22
80°
48°
23
72°
55°
24
70°
53°
25
73°
48°
26
80°
51°
27
78°
56°
28
66°
52°
29
66°
50°
30
69°
52°
1
73°
49°
2
76°
51°
3
73°
47°
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 66° to 80°, with overnight lows between 47° and 56°. The average high for September is 73° with an average low of 51°. 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.
