S
M
T
W
T
F
S
29
49°
26°
30
36°
20°
1
33°
17°
2
35°
26°
3
44°
26°
4
42°
26°
5
37°
25°
6
34°
21°
7
32°
16°
8
33°
25°
9
44°
25°
10
46°
24°
11
45°
24°
12
44°
24°
13
45°
25°
14
40°
21°
15
39°
23°
16
40°
15°
17
39°
13°
18
34°
7°
19
33°
4°
20
26°
12°
21
31°
17°
22
38°
12°
23
37°
13°
24
34°
16°
25
37°
19°
26
38°
19°
27
41°
15°
28
38°
8°
29
36°
13°
30
34°
6°
31
30°
3°
1
25°
15°
2
30°
21°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Seneca
Seneca's December 2026 forecast shows daily high temperatures ranging from 25° to 49°, with overnight lows between 3° and 26°. The average high for December is 37° with an average low of 18°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how December weather will actually feel in Seneca. See also: January | February | March.
