S
M
T
W
T
F
S
29
38°
20°
30
33°
18°
1
38°
18°
2
42°
21°
3
38°
20°
4
37°
22°
5
40°
21°
6
42°
23°
7
41°
21°
8
38°
17°
9
36°
21°
10
36°
14°
11
38°
10°
12
31°
15°
13
30°
16°
14
29°
20°
15
37°
21°
16
39°
18°
17
Hist. Avg.
35°
12°
18
Hist. Avg.
35°
12°
19
Hist. Avg.
35°
12°
20
Hist. Avg.
35°
12°
21
Hist. Avg.
35°
12°
22
Hist. Avg.
35°
12°
23
Hist. Avg.
35°
12°
24
Hist. Avg.
35°
12°
25
Hist. Avg.
35°
12°
26
Hist. Avg.
35°
12°
27
Hist. Avg.
35°
12°
28
Hist. Avg.
35°
12°
29
Hist. Avg.
35°
12°
30
Hist. Avg.
35°
12°
31
Hist. Avg.
36°
12°
1
Hist. Avg.
36°
12°
2
Hist. Avg.
36°
12°
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 29° to 42°, with overnight lows between 10° and 23°. The average high for December is 37° with an average low of 19°. 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.
