S
M
T
W
T
F
S
27
27°
5°
28
23°
6°
29
27°
5°
30
25°
10°
31
26°
19°
1
38°
16°
2
37°
9°
3
33°
4°
4
22°
5°
5
26°
15°
6
32°
18°
7
36°
16°
8
40°
2°
9
40°
2°
10
18°
12°
11
25°
6°
12
28°
5°
13
23°
1°
14
24°
-4°
15
19°
2°
16
17°
8°
17
25°
10°
18
27°
12°
19
37°
0°
20
36°
1°
21
16°
9°
22
22°
13°
23
31°
13°
24
34°
15°
25
33°
15°
26
34°
14°
27
34°
16°
28
35°
14°
29
39°
15°
30
37°
14°
31
Hist. Avg.
29°
6°
1
Hist. Avg.
30°
6°
2
Hist. Avg.
30°
6°
3
Hist. Avg.
30°
6°
4
Hist. Avg.
30°
6°
5
Hist. Avg.
30°
6°
6
Hist. Avg.
31°
6°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
January Weather in Thornton
Thornton's January 2027 forecast shows daily high temperatures ranging from 16° to 40°, with overnight lows between -4° and 19°. The average high for January is 29° with an average low of 9°. 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 Thornton. See also: February | March | April.
