S
M
T
W
T
F
S
30
65°
47°
31
64°
46°
1
63°
48°
2
63°
46°
3
64°
44°
4
65°
48°
5
68°
52°
6
71°
53°
7
65°
46°
8
67°
41°
9
64°
53°
10
70°
44°
11
73°
41°
12
66°
43°
13
70°
51°
14
72°
40°
15
68°
37°
16
57°
39°
17
58°
44°
18
60°
46°
19
63°
40°
20
62°
40°
21
58°
48°
22
61°
46°
23
62°
43°
24
60°
47°
25
59°
42°
26
65°
41°
27
57°
34°
28
57°
32°
29
52°
33°
30
51°
35°
1
53°
31°
2
50°
34°
3
52°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Shannon
Shannon's September 2026 forecast shows daily high temperatures ranging from 50° to 73°, with overnight lows between 31° and 53°. The average high for September is 62° with an average low of 43°. 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.
