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