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