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