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