S
M
T
W
T
F
S
29
47°
36°
30
50°
36°
1
49°
35°
2
49°
34°
3
46°
31°
4
42°
28°
5
46°
33°
6
48°
33°
7
39°
28°
8
34°
25°
9
34°
23°
10
35°
23°
11
33°
31°
12
35°
29°
13
35°
28°
14
33°
18°
15
33°
23°
16
34°
27°
17
36°
30°
18
37°
26°
19
42°
23°
20
35°
19°
21
33°
17°
22
31°
20°
23
29°
24°
24
33°
23°
25
32°
22°
26
31°
17°
27
30°
14°
28
29°
9°
29
28°
12°
30
27°
23°
31
35°
20°
1
36°
16°
2
29°
13°
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 50°, with overnight lows between 9° and 36°. The average high for December is 36° with an average low of 24°. 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.
