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Current conditions at
St. Louis Regional Airport (KALN)
Lat: 38.89°NLon: 90.03°WElev: 518ft.
Fair
28°F
-2°C
| Humidity | 73% |
| Wind Speed | S 6 mph |
| Barometer | 30.38 in |
| Dewpoint | 20°F (-7°C) |
| Visibility | 10.00 mi |
| Wind Chill | 21°F (-6°C) |
| Last update | 12 Jan 1:55 am CST |
Extended Forecast for
Alton IL
Overnight
Low: 27 °F
Clear
Monday
High: 50 °F
Sunny
Monday Night
Low: 37 °F
Partly Cloudy
Tuesday
High: 59 °F
Increasing
CloudsTuesday Night
Low: 38 °F
Slight Chance
Rain then
Mostly CloudyWednesday
High: 42 °F
Mostly Cloudy
and BreezyWednesday Night
Low: 18 °F
Mostly Cloudy
Thursday
High: 33 °F
Mostly Sunny
Thursday Night
Low: 27 °F
Mostly Cloudy
Detailed Forecast
Overnight
Clear, with a low around 27. South wind around 6 mph.
Monday
Sunny, with a high near 50. Southwest wind 6 to 11 mph, with gusts as high as 22 mph.
Monday Night
Partly cloudy, with a low around 37. Southwest wind 6 to 8 mph.
Tuesday
Increasing clouds, with a high near 59. West wind 8 to 15 mph, with gusts as high as 26 mph.
Tuesday Night
A 20 percent chance of rain before midnight. Mostly cloudy, with a low around 38. West wind 8 to 10 mph.
Wednesday
Mostly cloudy, with a high near 42. Breezy.
Wednesday Night
Mostly cloudy, with a low around 18.
Thursday
Mostly sunny, with a high near 33.
Thursday Night
Mostly cloudy, with a low around 27.
Friday
Partly sunny, with a high near 42.
Friday Night
Mostly cloudy, with a low around 23.
Saturday
Mostly cloudy, with a high near 31.
Saturday Night
Partly cloudy, with a low around 14.
Sunday
Mostly sunny, with a high near 32.
Additional Forecasts and Information
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Forecast AreaABOUT THIS FORECAST
Point Forecast:
Alton IL
38.91°N 90.16°W (Elev. 505 ft)
38.91°N 90.16°W (Elev. 505 ft)
12:31 am CST Jan 12, 2026
2am CST Jan 12, 2026-6pm CST Jan 18, 2026
Additional Resources
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