S
M
T
W
T
F
S
29
67°
46°
30
68°
46°
1
69°
44°
2
69°
42°
3
65°
44°
4
67°
46°
5
69°
45°
6
71°
46°
7
70°
46°
8
69°
43°
9
63°
45°
10
62°
42°
11
63°
40°
12
63°
40°
13
Hist. Avg.
66°
41°
14
Hist. Avg.
66°
41°
15
Hist. Avg.
66°
41°
16
Hist. Avg.
66°
41°
17
Hist. Avg.
66°
41°
18
Hist. Avg.
66°
41°
19
Hist. Avg.
66°
41°
20
Hist. Avg.
66°
41°
21
Hist. Avg.
66°
41°
22
Hist. Avg.
66°
41°
23
Hist. Avg.
66°
41°
24
Hist. Avg.
66°
41°
25
Hist. Avg.
66°
41°
26
Hist. Avg.
66°
41°
27
Hist. Avg.
67°
41°
28
Hist. Avg.
67°
42°
29
Hist. Avg.
67°
42°
30
Hist. Avg.
67°
42°
31
Hist. Avg.
67°
42°
1
Hist. Avg.
67°
42°
2
Hist. Avg.
67°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Ontario
Ontario's December 2026 forecast shows daily high temperatures ranging from 62° to 71°, with overnight lows between 40° and 46°. The average high for December is 67° with an average low of 44°. 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 Ontario. See also: January | February | March.
