S
M
T
W
T
F
S
27
23°
16°
28
27°
16°
29
33°
11°
30
33°
19°
31
32°
19°
1
34°
12°
2
36°
3°
3
35°
1°
4
18°
0°
5
17°
1°
6
17°
9°
7
25°
3°
8
23°
7°
9
23°
0°
10
27°
-2°
11
18°
-2°
12
17°
-5°
13
17°
-5°
14
13°
-4°
15
14°
0°
16
17°
8°
17
23°
10°
18
26°
0°
19
24°
8°
20
20°
13°
21
29°
15°
22
29°
11°
23
28°
9°
24
25°
8°
25
26°
11°
26
29°
16°
27
26°
14°
28
28°
12°
29
28°
13°
30
Hist. Avg.
25°
5°
31
Hist. Avg.
26°
5°
1
Hist. Avg.
26°
6°
2
Hist. Avg.
26°
6°
3
Hist. Avg.
26°
6°
4
Hist. Avg.
26°
6°
5
Hist. Avg.
26°
6°
6
Hist. Avg.
27°
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 13° to 36°, with overnight lows between -5° and 19°. The average high for January is 25° with an average low of 7°. 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.
