S
M
T
W
T
F
S
30
79°
47°
31
79°
43°
1
66°
50°
2
71°
55°
3
70°
51°
4
77°
42°
5
66°
45°
6
65°
50°
7
72°
51°
8
74°
42°
9
67°
40°
10
63°
45°
11
63°
45°
12
62°
40°
13
61°
43°
14
65°
46°
15
64°
50°
16
65°
47°
17
69°
42°
18
67°
43°
19
57°
47°
20
61°
44°
21
60°
40°
22
58°
38°
23
59°
41°
24
58°
42°
25
62°
43°
26
58°
37°
27
55°
36°
28
Hist. Avg.
56°
39°
29
Hist. Avg.
56°
39°
30
Hist. Avg.
55°
39°
1
Hist. Avg.
55°
38°
2
Hist. Avg.
54°
38°
3
Hist. Avg.
54°
37°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Lewis
Lewis's September 2026 forecast shows daily high temperatures ranging from 55° to 79°, with overnight lows between 36° and 55°. The average high for September is 65° 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 Lewis. See also: October | November | December.
