S
M
T
W
T
F
S
30
71°
46°
31
71°
42°
1
71°
45°
2
73°
54°
3
67°
58°
4
67°
59°
5
66°
53°
6
71°
46°
7
77°
45°
8
70°
46°
9
67°
44°
10
67°
51°
11
64°
44°
12
71°
40°
13
67°
54°
14
63°
43°
15
60°
38°
16
72°
49°
17
68°
45°
18
62°
44°
19
62°
36°
20
57°
40°
21
59°
42°
22
N/A
23
N/A
24
72°
34°
25
74°
47°
26
72°
49°
27
69°
47°
28
62°
49°
29
63°
47°
30
66°
50°
1
70°
50°
2
63°
47°
3
62°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Shannon
Shannon's September 2026 forecast shows daily high temperatures ranging from 62° to 74°, with overnight lows between 46° and 50°. The average high for September is 67° with an average low of 48°. 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 Shannon. See also: October | November | December.
