S
M
T
W
T
F
S
30
86°
60°
31
67°
55°
1
79°
48°
2
81°
50°
3
82°
50°
4
84°
52°
5
85°
53°
6
87°
47°
7
83°
55°
8
87°
50°
9
90°
48°
10
89°
43°
11
85°
44°
12
86°
53°
13
87°
53°
14
80°
60°
15
80°
54°
16
77°
58°
17
71°
58°
18
79°
57°
19
73°
50°
20
77°
49°
21
78°
51°
22
74°
52°
23
73°
50°
24
73°
55°
25
70°
54°
26
73°
56°
27
72°
54°
28
72°
52°
29
70°
51°
30
70°
52°
1
67°
50°
2
68°
41°
3
62°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Lewis
Lewis's September 2026 forecast shows daily high temperatures ranging from 62° to 78°, with overnight lows between 41° and 56°. The average high for September is 71° with an average low of 51°. 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.
