S
M
T
W
T
F
S
30
45°
36°
1
50°
33°
2
44°
34°
3
47°
32°
4
44°
30°
5
45°
39°
6
49°
32°
7
51°
30°
8
48°
37°
9
51°
28°
10
55°
34°
11
50°
32°
12
63°
33°
13
68°
32°
14
53°
20°
15
42°
16°
16
57°
21°
17
60°
27°
18
61°
40°
19
53°
32°
20
63°
28°
21
60°
34°
22
60°
34°
23
66°
53°
24
74°
52°
25
71°
51°
26
69°
59°
27
78°
56°
28
71°
61°
29
65°
28°
30
42°
27°
31
51°
27°
1
62°
29°
2
59°
38°
3
66°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Chattanooga
Chattanooga's December 2025 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for December is ° with an average low of °. 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 Chattanooga. See also: January | February | March.
