S
M
T
W
T
F
S
29
48°
30°
30
45°
25°
1
40°
28°
2
43°
30°
3
47°
31°
4
47°
29°
5
46°
29°
6
47°
25°
7
40°
25°
8
43°
31°
9
44°
27°
10
43°
31°
11
43°
34°
12
42°
23°
13
43°
21°
14
34°
24°
15
35°
26°
16
35°
25°
17
34°
28°
18
35°
32°
19
44°
28°
20
36°
21°
21
39°
26°
22
Hist. Avg.
38°
24°
23
Hist. Avg.
38°
24°
24
Hist. Avg.
38°
24°
25
Hist. Avg.
37°
24°
26
Hist. Avg.
37°
24°
27
Hist. Avg.
37°
24°
28
Hist. Avg.
37°
24°
29
Hist. Avg.
37°
24°
30
Hist. Avg.
37°
24°
31
Hist. Avg.
37°
24°
1
Hist. Avg.
37°
24°
2
Hist. Avg.
37°
24°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Boise
Boise's December 2026 forecast shows daily high temperatures ranging from 34° to 48°, with overnight lows between 21° and 34°. The average high for December is 41° with an average low of 27°. 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 Boise. See also: January | February | March.
