S
M
T
W
T
F
S
29
40°
28°
30
34°
27°
1
38°
28°
2
39°
28°
3
38°
27°
4
37°
26°
5
35°
24°
6
33°
25°
7
36°
17°
8
30°
14°
9
23°
16°
10
29°
23°
11
35°
23°
12
35°
22°
13
36°
25°
14
36°
24°
15
35°
23°
16
35°
23°
17
34°
22°
18
34°
22°
19
30°
20°
20
28°
19°
21
25°
17°
22
32°
7°
23
24°
5°
24
18°
1°
25
19°
5°
26
17°
15°
27
24°
8°
28
33°
5°
29
28°
0°
30
29°
-1°
31
14°
0°
1
13°
2°
2
15°
3°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Duluth
Duluth's December 2026 forecast shows daily high temperatures ranging from 13° to 40°, with overnight lows between -1° and 28°. The average high for December is 30° with an average low of 16°. 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 Duluth. See also: January | February | March.
