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