S
M
T
W
T
F
S
29
55°
33°
30
55°
25°
1
46°
21°
2
41°
22°
3
50°
32°
4
51°
31°
5
46°
31°
6
42°
26°
7
40°
20°
8
38°
20°
9
42°
24°
10
44°
27°
11
48°
26°
12
52°
26°
13
48°
29°
14
45°
24°
15
47°
24°
16
47°
23°
17
41°
16°
18
39°
14°
19
37°
11°
20
34°
10°
21
32°
24°
22
39°
15°
23
40°
18°
24
38°
12°
25
37°
21°
26
37°
25°
27
40°
23°
28
40°
18°
29
38°
18°
30
36°
17°
31
36°
12°
1
35°
10°
2
33°
19°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Eureka
Eureka's December 2026 forecast shows daily high temperatures ranging from 32° to 55°, with overnight lows between 10° and 33°. The average high for December is 42° with an average low of 21°. 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 Eureka. See also: January | February | March.
