S
M
T
W
T
F
S
29
49°
31°
30
46°
31°
1
44°
32°
2
45°
34°
3
49°
38°
4
48°
37°
5
51°
34°
6
46°
32°
7
48°
38°
8
48°
33°
9
47°
34°
10
46°
34°
11
43°
30°
12
42°
28°
13
41°
27°
14
40°
30°
15
41°
31°
16
42°
32°
17
41°
36°
18
43°
38°
19
49°
34°
20
46°
34°
21
49°
36°
22
Hist. Avg.
46°
33°
23
Hist. Avg.
46°
33°
24
Hist. Avg.
46°
33°
25
Hist. Avg.
46°
33°
26
Hist. Avg.
46°
33°
27
Hist. Avg.
46°
33°
28
Hist. Avg.
46°
33°
29
Hist. Avg.
46°
33°
30
Hist. Avg.
46°
33°
31
Hist. Avg.
46°
33°
1
Hist. Avg.
46°
33°
2
Hist. Avg.
46°
33°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Hillsboro
Hillsboro's December 2026 forecast shows daily high temperatures ranging from 40° to 51°, with overnight lows between 27° and 38°. The average high for December is 45° with an average low of 33°. 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 Hillsboro. See also: January | February | March.
