S
M
T
W
T
F
S
30
78°
55°
31
80°
56°
1
82°
56°
2
82°
55°
3
82°
56°
4
75°
55°
5
74°
54°
6
74°
54°
7
75°
55°
8
74°
54°
9
75°
54°
10
74°
53°
11
80°
53°
12
80°
52°
13
81°
53°
14
80°
51°
15
79°
49°
16
77°
48°
17
76°
49°
18
75°
48°
19
74°
50°
20
77°
49°
21
77°
48°
22
76°
47°
23
75°
48°
24
75°
48°
25
74°
47°
26
73°
46°
27
73°
45°
28
72°
45°
29
72°
44°
30
73°
41°
1
69°
43°
2
66°
41°
3
66°
41°
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 66° to 82°, with overnight lows between 41° and 56°. The average high for September is 76° with an average low of 50°. 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.
