S
M
T
W
T
F
S
29
42°
27°
30
41°
26°
1
42°
27°
2
42°
27°
3
43°
26°
4
44°
27°
5
40°
26°
6
42°
25°
7
44°
26°
8
45°
25°
9
38°
23°
10
37°
21°
11
37°
16°
12
42°
17°
13
40°
21°
14
46°
23°
15
47°
24°
16
46°
23°
17
46°
20°
18
39°
23°
19
36°
26°
20
40°
22°
21
43°
14°
22
43°
13°
23
34°
14°
24
35°
19°
25
40°
22°
26
40°
20°
27
36°
17°
28
35°
11°
29
35°
14°
30
36°
11°
31
34°
12°
1
34°
14°
2
35°
17°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Portola
Portola's December 2026 forecast shows daily high temperatures ranging from 34° to 47°, with overnight lows between 11° and 27°. The average high for December is 40° 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 Portola. See also: January | February | March.
