S
M
T
W
T
F
S
30
77°
50°
31
83°
51°
1
84°
56°
2
77°
58°
3
71°
52°
4
70°
48°
5
73°
45°
6
69°
47°
7
76°
54°
8
82°
52°
9
84°
52°
10
81°
62°
11
77°
55°
12
74°
54°
13
58°
46°
14
71°
48°
15
71°
50°
16
76°
49°
17
76°
52°
18
80°
55°
19
79°
53°
20
79°
52°
21
76°
51°
22
77°
53°
23
76°
51°
24
71°
45°
25
64°
48°
26
64°
48°
27
63°
43°
28
62°
40°
29
61°
39°
30
61°
39°
1
62°
48°
2
62°
46°
3
62°
41°
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 58° to 80°, with overnight lows between 39° and 55°. The average high for September is 70° with an average low of 48°. 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.
