S
M
T
W
T
F
S
30
88°
71°
31
91°
70°
1
94°
71°
2
96°
72°
3
95°
70°
4
94°
72°
5
95°
70°
6
88°
69°
7
85°
71°
8
87°
67°
9
90°
69°
10
91°
66°
11
90°
65°
12
85°
65°
13
86°
63°
14
85°
64°
15
84°
67°
16
78°
67°
17
78°
66°
18
80°
67°
19
79°
66°
20
77°
64°
21
78°
60°
22
79°
60°
23
78°
61°
24
82°
66°
25
83°
65°
26
77°
64°
27
75°
65°
28
75°
65°
29
76°
64°
30
78°
63°
1
74°
63°
2
74°
62°
3
75°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Seneca
Seneca's September 2026 forecast shows daily high temperatures ranging from 74° to 96°, with overnight lows between 60° and 72°. The average high for September is 83° with an average low of 66°. 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 Seneca. See also: October | November | December.
