S
M
T
W
T
F
S
30
93°
72°
31
96°
73°
1
98°
74°
2
99°
75°
3
95°
76°
4
92°
76°
5
93°
76°
6
96°
72°
7
93°
71°
8
92°
70°
9
94°
69°
10
91°
67°
11
92°
65°
12
88°
64°
13
87°
64°
14
86°
65°
15
87°
69°
16
82°
68°
17
83°
67°
18
85°
67°
19
85°
66°
20
81°
67°
21
81°
66°
22
82°
66°
23
84°
65°
24
85°
65°
25
86°
66°
26
84°
64°
27
85°
65°
28
86°
65°
29
83°
64°
30
85°
64°
1
81°
63°
2
81°
63°
3
80°
62°
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 80° to 99°, with overnight lows between 62° and 76°. The average high for September is 87° with an average low of 67°. 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.
