S
M
T
W
T
F
S
30
73°
49°
31
80°
47°
1
69°
55°
2
66°
50°
3
66°
49°
4
68°
47°
5
72°
49°
6
74°
53°
7
75°
55°
8
70°
52°
9
72°
53°
10
74°
52°
11
73°
51°
12
73°
52°
13
71°
51°
14
72°
50°
15
70°
50°
16
65°
51°
17
64°
50°
18
64°
46°
19
65°
51°
20
63°
47°
21
63°
44°
22
64°
45°
23
61°
44°
24
62°
43°
25
62°
44°
26
66°
44°
27
68°
52°
28
61°
50°
29
62°
44°
30
69°
50°
1
64°
51°
2
60°
49°
3
62°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Fort Lewis-Dupont
Fort Lewis-Dupont's September 2026 forecast shows daily high temperatures ranging from 60° to 75°, with overnight lows between 43° and 55°. The average high for September is 67° 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 Fort Lewis-Dupont. See also: October | November | December.
