S
M
T
W
T
F
S
30
77°
57°
31
75°
51°
1
81°
56°
2
82°
59°
3
84°
51°
4
79°
48°
5
75°
49°
6
78°
54°
7
81°
55°
8
81°
43°
9
77°
43°
10
70°
42°
11
68°
43°
12
70°
44°
13
69°
43°
14
70°
40°
15
67°
38°
16
66°
40°
17
66°
40°
18
67°
39°
19
65°
40°
20
66°
40°
21
67°
44°
22
73°
47°
23
75°
48°
24
73°
49°
25
74°
45°
26
72°
42°
27
66°
44°
28
67°
40°
29
63°
38°
30
62°
44°
1
63°
36°
2
62°
45°
3
61°
36°
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 61° to 84°, with overnight lows between 36° and 59°. The average high for September is 71° with an average low of 45°. 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.
