S
M
T
W
T
F
S
29
36°
26°
30
38°
31°
1
36°
31°
2
37°
30°
3
38°
31°
4
37°
31°
5
37°
30°
6
35°
29°
7
34°
25°
8
36°
26°
9
40°
29°
10
36°
22°
11
23°
17°
12
24°
23°
13
31°
27°
14
30°
29°
15
33°
32°
16
43°
29°
17
36°
22°
18
36°
17°
19
29°
15°
20
27°
20°
21
24°
21°
22
31°
12°
23
27°
12°
24
21°
20°
25
32°
26°
26
31°
25°
27
34°
13°
28
31°
10°
29
23°
12°
30
23°
11°
31
22°
9°
1
20°
7°
2
19°
10°
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 19° to 43°, with overnight lows between 7° and 32°. The average high for December is 31° with an average low of 22°. 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.
