S
M
T
W
T
F
S
30
81°
55°
31
79°
54°
1
79°
50°
2
78°
50°
3
79°
47°
4
79°
47°
5
77°
45°
6
68°
43°
7
68°
46°
8
67°
52°
9
66°
49°
10
67°
48°
11
67°
42°
12
66°
46°
13
66°
51°
14
67°
47°
15
65°
45°
16
64°
43°
17
66°
45°
18
69°
46°
19
74°
44°
20
74°
44°
21
71°
41°
22
63°
39°
23
63°
42°
24
64°
41°
25
62°
40°
26
62°
41°
27
63°
43°
28
62°
44°
29
61°
41°
30
60°
41°
1
61°
44°
2
65°
48°
3
68°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Maple Valley
Maple Valley's September 2026 forecast shows daily high temperatures ranging from 60° to 81°, with overnight lows between 39° and 55°. The average high for September is 68° with an average low of 45°. 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 Maple Valley. See also: October | November | December.
