S
M
T
W
T
F
S
29
33°
9°
30
31°
8°
1
32°
19°
2
34°
20°
3
34°
19°
4
33°
12°
5
31°
10°
6
32°
9°
7
36°
12°
8
32°
12°
9
34°
11°
10
32°
13°
11
35°
13°
12
36°
14°
13
38°
17°
14
35°
13°
15
39°
11°
16
38°
13°
17
34°
11°
18
38°
15°
19
42°
16°
20
41°
12°
21
36°
15°
22
40°
15°
23
41°
14°
24
39°
18°
25
38°
11°
26
42°
4°
27
34°
5°
28
28°
14°
29
33°
8°
30
34°
16°
31
35°
17°
1
39°
13°
2
38°
11°
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 28° to 42°, with overnight lows between 4° and 20°. The average high for December is 36° with an average low of 13°. 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.
