S
M
T
W
T
F
S
29
33°
24°
30
33°
22°
1
31°
20°
2
31°
19°
3
32°
22°
4
36°
21°
5
35°
22°
6
37°
27°
7
31°
30°
8
30°
29°
9
30°
23°
10
29°
23°
11
42°
24°
12
39°
25°
13
32°
24°
14
35°
21°
15
34°
15°
16
28°
22°
17
28°
20°
18
31°
22°
19
34°
27°
20
34°
28°
21
35°
28°
22
38°
27°
23
38°
28°
24
39°
30°
25
42°
22°
26
41°
23°
27
36°
19°
28
30°
22°
29
29°
25°
30
37°
25°
31
37°
28°
1
39°
29°
2
41°
24°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Johnson City
Johnson City's December 2026 forecast shows daily high temperatures ranging from 28° to 42°, with overnight lows between 15° and 30°. The average high for December is 34° with an average low of 24°. 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 Johnson City. See also: January | February | March.
