S
M
T
W
T
F
S
29
63°
45°
30
63°
39°
1
61°
39°
2
59°
41°
3
61°
40°
4
55°
38°
5
59°
41°
6
62°
45°
7
61°
41°
8
62°
42°
9
59°
39°
10
59°
36°
11
53°
30°
12
46°
33°
13
53°
27°
14
48°
26°
15
43°
30°
16
46°
34°
17
45°
30°
18
50°
28°
19
46°
33°
20
50°
42°
21
56°
43°
22
60°
42°
23
57°
37°
24
59°
32°
25
49°
33°
26
54°
41°
27
43°
26°
28
47°
41°
29
56°
34°
30
Hist. Avg.
49°
32°
31
Hist. Avg.
49°
32°
1
Hist. Avg.
49°
32°
2
Hist. Avg.
49°
32°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Helena
Helena's December 2026 forecast shows daily high temperatures ranging from 43° to 63°, with overnight lows between 26° and 45°. The average high for December is 54° with an average low of 36°. 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 Helena. See also: January | February | March.
