S
M
T
W
T
F
S
29
34°
21°
30
34°
20°
1
36°
23°
2
36°
23°
3
37°
32°
4
38°
32°
5
44°
29°
6
41°
28°
7
40°
26°
8
40°
29°
9
41°
30°
10
44°
21°
11
37°
20°
12
Hist. Avg.
39°
26°
13
Hist. Avg.
39°
25°
14
Hist. Avg.
39°
25°
15
Hist. Avg.
38°
25°
16
Hist. Avg.
38°
25°
17
Hist. Avg.
38°
25°
18
Hist. Avg.
38°
25°
19
Hist. Avg.
38°
25°
20
Hist. Avg.
38°
25°
21
Hist. Avg.
38°
24°
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 44°, with overnight lows between 20° and 32°. The average high for December is 39° with an average low of 26°. 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.
