S
M
T
W
T
F
S
29
49°
32°
30
48°
24°
1
37°
18°
2
34°
17°
3
42°
30°
4
43°
30°
5
40°
29°
6
36°
24°
7
34°
20°
8
32°
21°
9
37°
23°
10
41°
28°
11
42°
28°
12
46°
25°
13
43°
28°
14
39°
26°
15
40°
23°
16
41°
21°
17
37°
16°
18
34°
13°
19
33°
10°
20
30°
9°
21
27°
22°
22
35°
14°
23
36°
17°
24
36°
8°
25
31°
19°
26
31°
23°
27
36°
22°
28
36°
18°
29
35°
14°
30
32°
15°
31
31°
7°
1
31°
4°
2
27°
14°
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 27° to 49°, with overnight lows between 4° and 32°. The average high for December is 37° with an average low of 20°. 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.
