S
M
T
W
T
F
S
29
41°
27°
30
38°
26°
1
29°
25°
2
31°
18°
3
31°
23°
4
34°
24°
5
33°
24°
6
30°
16°
7
23°
9°
8
22°
12°
9
25°
14°
10
33°
21°
11
34°
21°
12
35°
20°
13
32°
20°
14
21°
20°
15
31°
16°
16
32°
16°
17
28°
17°
18
29°
15°
19
28°
10°
20
26°
5°
21
22°
16°
22
28°
13°
23
30°
16°
24
28°
11°
25
30°
8°
26
24°
16°
27
25°
17°
28
31°
15°
29
29°
11°
30
27°
9°
31
26°
1°
1
27°
-2°
2
16°
3°
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 16° to 41°, with overnight lows between -2° and 27°. The average high for December is 29° with an average low of 15°. 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.
