S
M
T
W
T
F
S
29
63°
52°
30
65°
47°
1
65°
46°
2
63°
42°
3
61°
42°
4
62°
41°
5
61°
40°
6
60°
41°
7
60°
41°
8
61°
43°
9
61°
51°
10
68°
52°
11
70°
44°
12
56°
39°
13
68°
50°
14
68°
51°
15
Hist. Avg.
63°
44°
16
Hist. Avg.
63°
44°
17
Hist. Avg.
63°
44°
18
Hist. Avg.
62°
44°
19
Hist. Avg.
62°
44°
20
Hist. Avg.
62°
44°
21
Hist. Avg.
62°
43°
22
Hist. Avg.
62°
43°
23
Hist. Avg.
62°
43°
24
Hist. Avg.
62°
43°
25
Hist. Avg.
62°
43°
26
Hist. Avg.
61°
43°
27
Hist. Avg.
61°
43°
28
Hist. Avg.
61°
43°
29
Hist. Avg.
61°
42°
30
Hist. Avg.
61°
42°
31
Hist. Avg.
61°
42°
1
Hist. Avg.
61°
42°
2
Hist. Avg.
61°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Slidell
Slidell's December 2026 forecast shows daily high temperatures ranging from 56° to 70°, with overnight lows between 39° and 52°. The average high for December is 63° 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.
