Monthly Historical AveragesAlton, IL
Average Temperature
High
30°
Feels 32
Low
19°
Feels 19
Average Precipitation
12 Days
133.6mm
0cm
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Daily Historical Averages
S
M
T
W
T
F
S
ForecastTuesday, June 9, 2026
Day
32°Feels 42
Wind
16 km/h SW
Gust
25 km/h
Humidity
66%
P.O.P
90%
Rain
2-4 mm
Night
24°Feels 24
Wind
12 km/h S
Gust
18 km/h
Humidity
89%
P.O.P
20%
Historical AveragesJun 9
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity