S
M
T
W
T
F
S
29
49°
34°
30
46°
31°
1
41°
25°
2
36°
24°
3
36°
25°
4
37°
24°
5
36°
24°
6
37°
31°
7
49°
36°
8
45°
37°
9
47°
33°
10
45°
31°
11
43°
32°
12
42°
34°
13
44°
35°
14
44°
33°
15
45°
34°
16
43°
29°
17
42°
31°
18
40°
33°
19
42°
33°
20
44°
32°
21
40°
30°
22
41°
30°
23
41°
31°
24
40°
33°
25
39°
35°
26
42°
35°
27
48°
34°
28
46°
35°
29
44°
30°
30
45°
31°
31
43°
34°
1
44°
35°
2
47°
30°
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 36° to 49°, with overnight lows between 24° and 37°. The average high for December is 43° with an average low of 32°. 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.
