S
M
T
W
T
F
S
29
58°
41°
30
59°
49°
1
62°
52°
2
68°
52°
3
60°
51°
4
60°
51°
5
61°
48°
6
59°
46°
7
64°
45°
8
58°
41°
9
59°
40°
10
58°
46°
11
72°
41°
12
72°
37°
13
71°
38°
14
56°
39°
15
57°
37°
16
58°
38°
17
57°
50°
18
64°
52°
19
68°
51°
20
70°
51°
21
70°
50°
22
69°
53°
23
72°
42°
24
70°
36°
25
70°
35°
26
54°
37°
27
55°
44°
28
60°
49°
29
67°
51°
30
68°
52°
31
69°
52°
1
69°
46°
2
70°
39°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Slidell
Slidell's December 2026 forecast shows daily high temperatures ranging from 54° to 72°, with overnight lows between 35° and 53°. The average high for December is 64° with an average low of 45°. 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 Slidell. See also: January | February | March.
