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