S
M
T
W
T
F
S
29
41°
34°
30
41°
34°
1
42°
35°
2
43°
34°
3
45°
34°
4
43°
35°
5
46°
34°
6
47°
31°
7
43°
33°
8
45°
33°
9
47°
32°
10
42°
32°
11
37°
26°
12
40°
27°
13
42°
31°
14
44°
32°
15
47°
31°
16
46°
30°
17
47°
26°
18
45°
24°
19
41°
21°
20
40°
27°
21
40°
22°
22
41°
19°
23
36°
22°
24
36°
30°
25
41°
30°
26
41°
28°
27
42°
23°
28
41°
24°
29
39°
18°
30
38°
19°
31
36°
18°
1
37°
20°
2
37°
24°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Heppner
Heppner's December 2026 forecast shows daily high temperatures ranging from 36° to 47°, with overnight lows between 18° and 35°. The average high for December is 42° with an average low of 28°. 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 Heppner. See also: January | February | March.
