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