S
M
T
W
T
F
S
29
49°
40°
30
46°
40°
1
46°
39°
2
45°
40°
3
47°
40°
4
46°
39°
5
45°
40°
6
47°
40°
7
47°
39°
8
46°
40°
9
49°
38°
10
46°
38°
11
41°
31°
12
40°
34°
13
42°
38°
14
44°
39°
15
47°
42°
16
50°
37°
17
49°
34°
18
48°
31°
19
43°
30°
20
41°
31°
21
40°
30°
22
41°
27°
23
40°
30°
24
38°
35°
25
42°
36°
26
42°
32°
27
43°
31°
28
42°
30°
29
41°
29°
30
40°
29°
31
39°
30°
1
40°
28°
2
38°
29°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in James Bay
James Bay's December 2026 forecast shows daily high temperatures ranging from 38° to 50°, with overnight lows between 27° and 42°. The average high for December is 44° with an average low of 35°. 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 James Bay. See also: January | February | March.
