S
M
T
W
T
F
S
30
84°
53°
31
83°
51°
1
85°
54°
2
86°
57°
3
86°
55°
4
85°
51°
5
84°
53°
6
82°
52°
7
79°
51°
8
78°
48°
9
78°
48°
10
79°
49°
11
78°
49°
12
81°
48°
13
83°
50°
14
83°
52°
15
82°
51°
16
80°
47°
17
78°
48°
18
79°
47°
19
78°
46°
20
80°
45°
21
80°
49°
22
79°
51°
23
76°
50°
24
73°
51°
25
72°
50°
26
73°
44°
27
72°
47°
28
74°
46°
29
74°
49°
30
79°
51°
1
72°
47°
2
76°
49°
3
Hist. Avg.
88°
59°
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 72° to 86°, with overnight lows between 44° and 57°. The average high for September is 79° with an average low of 50°. 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.
