S
M
T
W
T
F
S
29
52°
46°
30
62°
46°
1
59°
48°
2
62°
46°
3
57°
42°
4
55°
39°
5
60°
42°
6
58°
42°
7
50°
40°
8
48°
36°
9
48°
35°
10
47°
31°
11
46°
30°
12
46°
30°
13
48°
31°
14
49°
29°
15
47°
34°
16
47°
40°
17
49°
42°
18
55°
39°
19
56°
29°
20
51°
27°
21
46°
26°
22
43°
29°
23
47°
33°
24
45°
29°
25
45°
27°
26
43°
27°
27
44°
28°
28
44°
27°
29
46°
31°
30
48°
35°
31
55°
29°
1
53°
25°
2
44°
24°
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 43° to 62°, with overnight lows between 24° and 48°. The average high for December is 50° with an average low of 34°. 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.
