S
M
T
W
T
F
S
29
35°
18°
30
22°
13°
1
25°
18°
2
35°
19°
3
35°
18°
4
32°
18°
5
31°
17°
6
26°
16°
7
24°
16°
8
34°
17°
9
34°
17°
10
33°
16°
11
34°
17°
12
33°
16°
13
34°
16°
14
27°
12°
15
29°
11°
16
28°
5°
17
26°
6°
18
21°
-5°
19
18°
-3°
20
13°
11°
21
28°
7°
22
27°
6°
23
24°
9°
24
26°
8°
25
27°
10°
26
26°
5°
27
26°
-7°
28
18°
-5°
29
12°
-7°
30
11°
-8°
31
10°
0°
1
11°
7°
2
21°
8°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Fortuna
Fortuna's December 2026 forecast shows daily high temperatures ranging from 10° to 35°, with overnight lows between -8° and 19°. The average high for December is 26° with an average low of 9°. 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 Fortuna. See also: January | February | March.
