S
M
T
W
T
F
S
29
46°
30°
30
43°
29°
1
40°
26°
2
39°
29°
3
38°
25°
4
40°
21°
5
38°
24°
6
37°
26°
7
36°
24°
8
39°
18°
9
37°
17°
10
32°
15°
11
31°
28°
12
44°
23°
13
34°
26°
14
Hist. Avg.
39°
23°
15
Hist. Avg.
38°
23°
16
Hist. Avg.
38°
22°
17
Hist. Avg.
38°
22°
18
Hist. Avg.
38°
22°
19
Hist. Avg.
37°
21°
20
Hist. Avg.
37°
21°
21
Hist. Avg.
37°
21°
22
Hist. Avg.
36°
21°
23
Hist. Avg.
36°
20°
24
Hist. Avg.
36°
20°
25
Hist. Avg.
36°
20°
26
Hist. Avg.
36°
20°
27
Hist. Avg.
35°
19°
28
Hist. Avg.
35°
19°
29
Hist. Avg.
35°
19°
30
Hist. Avg.
34°
19°
31
Hist. Avg.
34°
18°
1
Hist. Avg.
34°
18°
2
Hist. Avg.
34°
18°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Portland
Portland's December 2026 forecast shows daily high temperatures ranging from 31° to 46°, with overnight lows between 15° and 30°. The average high for December is 38° with an average low of 24°. 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 Portland. See also: January | February | March.
