S
M
T
W
T
F
S
30
79°
50°
31
83°
54°
1
83°
58°
2
81°
59°
3
72°
55°
4
72°
54°
5
74°
48°
6
71°
49°
7
75°
57°
8
83°
51°
9
85°
51°
10
87°
64°
11
78°
53°
12
77°
58°
13
67°
50°
14
73°
47°
15
64°
54°
16
79°
52°
17
84°
52°
18
83°
52°
19
86°
50°
20
82°
45°
21
85°
48°
22
79°
43°
23
73°
43°
24
65°
46°
25
63°
38°
26
67°
36°
27
71°
38°
28
72°
41°
29
72°
42°
30
71°
42°
1
70°
38°
2
71°
36°
3
65°
34°
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 63° to 85°, with overnight lows between 34° and 48°. The average high for September is 72° with an average low of 41°. 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.
