S
M
T
W
T
F
S
30
99°
77°
31
96°
76°
1
99°
71°
2
99°
70°
3
97°
74°
4
96°
70°
5
99°
69°
6
97°
70°
7
100°
76°
8
102°
73°
9
82°
60°
10
86°
63°
11
90°
66°
12
84°
66°
13
87°
66°
14
76°
56°
15
72°
54°
16
75°
57°
17
80°
56°
18
74°
58°
19
74°
54°
20
77°
52°
21
83°
58°
22
82°
58°
23
82°
59°
24
79°
59°
25
78°
58°
26
79°
57°
27
79°
57°
28
78°
58°
29
76°
57°
30
76°
50°
1
67°
45°
2
65°
43°
3
64°
41°
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 64° to 102°, with overnight lows between 41° and 76°. The average high for September is 80° with an average low of 58°. 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.
