S
M
T
W
T
F
S
27
46°
35°
28
50°
35°
29
50°
33°
30
51°
29°
31
49°
24°
1
47°
22°
2
35°
23°
3
37°
24°
4
41°
23°
5
43°
23°
6
37°
22°
7
39°
20°
8
34°
28°
9
37°
25°
10
38°
20°
11
34°
20°
12
36°
21°
13
38°
22°
14
41°
25°
15
44°
28°
16
32°
27°
17
35°
28°
18
Hist. Avg.
39°
21°
19
Hist. Avg.
39°
21°
20
Hist. Avg.
39°
21°
21
Hist. Avg.
39°
21°
22
Hist. Avg.
39°
21°
23
Hist. Avg.
39°
21°
24
Hist. Avg.
39°
21°
25
Hist. Avg.
39°
21°
26
Hist. Avg.
39°
21°
27
Hist. Avg.
40°
21°
28
Hist. Avg.
40°
21°
29
Hist. Avg.
40°
22°
30
Hist. Avg.
40°
22°
31
Hist. Avg.
40°
22°
1
Hist. Avg.
40°
22°
2
Hist. Avg.
40°
22°
3
Hist. Avg.
41°
22°
4
Hist. Avg.
41°
22°
5
Hist. Avg.
41°
23°
6
Hist. Avg.
41°
23°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
January Weather in Alton
Alton's January 2027 forecast shows daily high temperatures ranging from 32° to 51°, with overnight lows between 20° and 35°. The average high for January is 41° with an average low of 25°. 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 Alton. See also: February | March | April.
