S
M
T
W
T
F
S
30
78°
48°
31
84°
48°
1
87°
51°
2
75°
57°
3
71°
44°
4
69°
48°
5
72°
43°
6
71°
43°
7
77°
49°
8
82°
48°
9
89°
49°
10
81°
57°
11
73°
54°
12
76°
55°
13
62°
47°
14
75°
50°
15
77°
50°
16
80°
45°
17
84°
45°
18
85°
49°
19
83°
46°
20
82°
44°
21
80°
43°
22
81°
44°
23
81°
45°
24
76°
40°
25
67°
42°
26
68°
40°
27
67°
36°
28
66°
35°
29
65°
33°
30
65°
33°
1
66°
42°
2
67°
40°
3
65°
34°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Leavenworth
Leavenworth's September 2026 forecast shows daily high temperatures ranging from 62° to 85°, with overnight lows between 33° and 55°. The average high for September is 74° with an average low of 43°. 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 Leavenworth. See also: October | November | December.
