S
M
T
W
T
F
S
29
49°
38°
30
50°
37°
1
50°
36°
2
49°
37°
3
49°
38°
4
48°
37°
5
47°
35°
6
44°
35°
7
43°
36°
8
44°
35°
9
42°
36°
10
45°
35°
11
44°
34°
12
46°
35°
13
43°
35°
14
46°
33°
15
43°
33°
16
41°
34°
17
41°
30°
18
40°
24°
19
38°
24°
20
36°
23°
21
34°
27°
22
35°
26°
23
39°
23°
24
35°
22°
25
34°
21°
26
33°
21°
27
32°
23°
28
36°
25°
29
37°
26°
30
37°
27°
31
39°
26°
1
36°
22°
2
44°
34°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Lewiston
Lewiston's December 2026 forecast shows daily high temperatures ranging from 32° to 50°, with overnight lows between 21° and 38°. The average high for December is 41° with an average low of 30°. 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 Lewiston. See also: January | February | March.
