S
M
T
W
T
F
S
29
37°
25°
30
36°
26°
1
37°
28°
2
38°
34°
3
44°
35°
4
46°
36°
5
45°
31°
6
45°
26°
7
42°
31°
8
38°
31°
9
48°
35°
10
43°
31°
11
42°
30°
12
Hist. Avg.
41°
30°
13
Hist. Avg.
41°
30°
14
Hist. Avg.
41°
30°
15
Hist. Avg.
41°
30°
16
Hist. Avg.
40°
30°
17
Hist. Avg.
40°
29°
18
Hist. Avg.
40°
29°
19
Hist. Avg.
40°
29°
20
Hist. Avg.
40°
29°
21
Hist. Avg.
40°
29°
22
Hist. Avg.
40°
29°
23
Hist. Avg.
40°
29°
24
Hist. Avg.
40°
29°
25
Hist. Avg.
40°
29°
26
Hist. Avg.
40°
29°
27
Hist. Avg.
40°
29°
28
Hist. Avg.
39°
29°
29
Hist. Avg.
39°
29°
30
Hist. Avg.
39°
29°
31
Hist. Avg.
39°
29°
1
Hist. Avg.
39°
29°
2
Hist. Avg.
39°
29°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Mattawa
Mattawa's December 2026 forecast shows daily high temperatures ranging from 36° to 48°, with overnight lows between 25° and 36°. The average high for December is 42° with an average low of 31°. 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 Mattawa. See also: January | February | March.
