S
M
T
W
T
F
S
29
60°
32°
30
62°
27°
1
51°
27°
2
46°
28°
3
49°
31°
4
54°
36°
5
56°
43°
6
61°
43°
7
62°
36°
8
61°
34°
9
51°
38°
10
55°
34°
11
56°
28°
12
51°
34°
13
50°
32°
14
45°
27°
15
47°
26°
16
47°
27°
17
48°
27°
18
45°
28°
19
46°
31°
20
51°
33°
21
49°
38°
22
59°
34°
23
55°
36°
24
54°
32°
25
52°
25°
26
48°
25°
27
47°
27°
28
47°
32°
29
52°
26°
30
43°
24°
31
45°
23°
1
44°
24°
2
45°
25°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Alpharetta
Alpharetta's December 2026 forecast shows daily high temperatures ranging from 43° to 62°, with overnight lows between 23° and 43°. The average high for December is 51° with an average low of 31°. 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 Alpharetta. See also: January | February | March.
