S
M
T
W
T
F
S
30
85°
59°
31
82°
58°
1
82°
58°
2
83°
57°
3
81°
56°
4
80°
55°
5
79°
54°
6
80°
55°
7
74°
44°
8
71°
43°
9
73°
45°
10
75°
46°
11
74°
45°
12
72°
46°
13
74°
48°
14
80°
47°
15
80°
51°
16
81°
53°
17
80°
54°
18
80°
56°
19
78°
52°
20
77°
54°
21
79°
45°
22
72°
47°
23
67°
48°
24
67°
43°
25
69°
43°
26
73°
45°
27
70°
40°
28
65°
43°
29
68°
46°
30
69°
39°
1
65°
43°
2
71°
48°
3
73°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Chelan
Chelan's September 2026 forecast shows daily high temperatures ranging from 65° to 85°, with overnight lows between 39° and 59°. The average high for September is 75° with an average low of 49°. 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 Chelan. See also: October | November | December.
