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Current conditions at
St. Louis Regional Airport (KALN)
Lat: 38.89°NLon: 90.03°WElev: 518ft.
Partly Cloudy
86°F
30°C
| Humidity | 59% |
| Wind Speed | NE 6 mph |
| Barometer | 30.14 in |
| Dewpoint | 70°F (21°C) |
| Visibility | 10.00 mi |
| Heat Index | 91°F (33°C) |
| Last update | 12 Jul 3:45 pm CDT |
Extended Forecast for
Alton IL
Tonight
Low: 67 °F
Clear
Monday
High: 87 °F
Sunny
Monday Night
Low: 67 °F
Clear
Tuesday
High: 90 °F
Sunny
Tuesday Night
Low: 71 °F
Mostly Clear
Wednesday
High: 91 °F
Sunny
Wednesday Night
Low: 73 °F
Mostly Clear
Thursday
High: 93 °F
Sunny
Thursday Night
Low: 73 °F
Mostly Clear
Detailed Forecast
Tonight
Clear, with a low around 67. Northeast wind 5 to 9 mph becoming light after midnight.
Monday
Sunny, with a high near 87. Light northeast wind increasing to 5 to 10 mph in the morning.
Monday Night
Clear, with a low around 67. Northeast wind 5 to 7 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 90. Northeast wind 3 to 8 mph.
Tuesday Night
Mostly clear, with a low around 71. Northeast wind around 6 mph becoming calm in the evening.
Wednesday
Sunny, with a high near 91.
Wednesday Night
Mostly clear, with a low around 73.
Thursday
Sunny, with a high near 93.
Thursday Night
Mostly clear, with a low around 73.
Friday
Sunny, with a high near 93.
Friday Night
Mostly clear, with a low around 74.
Saturday
Sunny, with a high near 93.
Saturday Night
Mostly clear, with a low around 73.
Sunday
Sunny, with a high near 93.
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)
4:46 pm CDT Jul 12, 2026
4pm CDT Jul 12, 2026-6pm CDT Jul 19, 2026
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