S
M
T
W
T
F
S
29
57°
40°
30
56°
30°
1
55°
30°
2
42°
28°
3
43°
27°
4
40°
37°
5
51°
35°
6
53°
29°
7
45°
27°
8
41°
31°
9
42°
28°
10
41°
25°
11
40°
26°
12
41°
25°
13
41°
24°
14
40°
22°
15
37°
21°
16
36°
24°
17
Hist. Avg.
44°
30°
18
Hist. Avg.
44°
29°
19
Hist. Avg.
44°
29°
20
Hist. Avg.
43°
29°
21
Hist. Avg.
43°
29°
22
Hist. Avg.
43°
28°
23
Hist. Avg.
43°
28°
24
Hist. Avg.
42°
28°
25
Hist. Avg.
42°
28°
26
Hist. Avg.
42°
28°
27
Hist. Avg.
42°
27°
28
Hist. Avg.
42°
27°
29
Hist. Avg.
41°
27°
30
Hist. Avg.
41°
27°
31
Hist. Avg.
41°
27°
1
Hist. Avg.
41°
26°
2
Hist. Avg.
40°
26°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Smithtown
Smithtown's December 2026 forecast shows daily high temperatures ranging from 36° to 57°, with overnight lows between 21° and 40°. The average high for December is 45° with an average low of 28°. 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 Smithtown. See also: January | February | March.
