S
M
T
W
T
F
S
27
35°
19°
28
35°
19°
29
36°
23°
30
35°
20°
31
35°
17°
1
36°
13°
2
34°
13°
3
30°
19°
4
33°
30°
5
37°
31°
6
45°
22°
7
46°
16°
8
35°
17°
9
32°
20°
10
34°
15°
11
34°
13°
12
31°
13°
13
29°
14°
14
32°
14°
15
31°
15°
16
33°
20°
17
37°
16°
18
33°
14°
19
31°
14°
20
30°
16°
21
32°
24°
22
35°
30°
23
40°
30°
24
43°
27°
25
43°
24°
26
40°
27°
27
40°
27°
28
41°
25°
29
40°
21°
30
36°
17°
31
34°
11°
1
29°
19°
2
Hist. Avg.
42°
25°
3
Hist. Avg.
42°
25°
4
Hist. Avg.
42°
25°
5
Hist. Avg.
43°
25°
6
Hist. Avg.
43°
25°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
January Weather in Waterloo
Waterloo's January 2027 forecast shows daily high temperatures ranging from 29° to 46°, with overnight lows between 11° and 31°. The average high for January is 35° with an average low of 20°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how January weather will actually feel in Waterloo. See also: February | March | April.
