S
M
T
W
T
F
S
30
98°
74°
31
99°
75°
1
99°
75°
2
99°
76°
3
98°
76°
4
97°
76°
5
99°
75°
6
96°
74°
7
95°
74°
8
101°
80°
9
96°
69°
10
85°
65°
11
82°
69°
12
90°
65°
13
80°
62°
14
76°
58°
15
74°
58°
16
79°
62°
17
80°
61°
18
78°
60°
19
77°
56°
20
77°
62°
21
80°
61°
22
79°
61°
23
80°
62°
24
80°
62°
25
79°
61°
26
78°
61°
27
78°
60°
28
77°
61°
29
76°
60°
30
74°
56°
1
70°
50°
2
64°
46°
3
63°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Lee's Summit
Lee's Summit's September 2026 forecast shows daily high temperatures ranging from 63° to 101°, with overnight lows between 45° and 80°. The average high for September is 80° with an average low of 61°. 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 Lee's Summit. See also: October | November | December.
