S
M
T
W
T
F
S
30
82°
51°
31
85°
50°
1
86°
52°
2
86°
51°
3
85°
50°
4
85°
50°
5
84°
50°
6
84°
49°
7
77°
44°
8
76°
45°
9
83°
49°
10
83°
49°
11
73°
39°
12
77°
45°
13
84°
49°
14
86°
48°
15
81°
46°
16
80°
45°
17
81°
48°
18
82°
47°
19
83°
44°
20
80°
43°
21
79°
45°
22
80°
43°
23
76°
39°
24
73°
35°
25
70°
35°
26
72°
36°
27
76°
38°
28
76°
39°
29
75°
42°
30
76°
34°
1
71°
34°
2
71°
39°
3
74°
39°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Methow Valley
Methow Valley's September 2026 forecast shows daily high temperatures ranging from 70° to 86°, with overnight lows between 34° and 52°. The average high for September is 79° with an average low of 44°. 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 Methow Valley. See also: October | November | December.
