S
M
T
W
T
F
S
29
40°
28°
30
38°
33°
1
42°
26°
2
41°
29°
3
36°
32°
4
40°
33°
5
42°
21°
6
39°
28°
7
36°
23°
8
38°
22°
9
34°
31°
10
37°
32°
11
41°
30°
12
42°
26°
13
41°
26°
14
40°
22°
15
39°
25°
16
41°
28°
17
41°
31°
18
42°
33°
19
42°
31°
20
43°
27°
21
39°
26°
22
33°
30°
23
36°
25°
24
40°
26°
25
38°
23°
26
39°
29°
27
39°
29°
28
40°
16°
29
33°
17°
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 33° to 43°, with overnight lows between 16° and 33°. The average high for December is 39° 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.
