S
M
T
W
T
F
S
29
57°
47°
30
67°
47°
1
66°
49°
2
65°
47°
3
64°
42°
4
54°
38°
5
61°
41°
6
61°
45°
7
58°
41°
8
52°
40°
9
52°
39°
10
50°
35°
11
50°
32°
12
51°
33°
13
55°
32°
14
53°
31°
15
51°
36°
16
51°
42°
17
56°
43°
18
59°
43°
19
58°
31°
20
55°
28°
21
51°
28°
22
48°
31°
23
49°
34°
24
50°
29°
25
50°
28°
26
47°
29°
27
49°
28°
28
48°
28°
29
49°
32°
30
50°
37°
31
60°
30°
1
59°
26°
2
47°
24°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Johnston
Johnston's December 2026 forecast shows daily high temperatures ranging from 47° to 67°, with overnight lows between 24° and 49°. The average high for December is 54° with an average low of 36°. 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 Johnston. See also: January | February | March.
