Current conditions at
St. Louis Regional Airport (KALN)
Lat: 38.89°NLon: 90.03°WElev: 518ft.
Fair
51°F
11°C
| Humidity | 83% |
| Wind Speed | Calm |
| Barometer | 30.10 in |
| Dewpoint | 46°F (8°C) |
| Visibility | 10.00 mi |
| Last update | 9 Oct 4:55 am CDT |
Extended Forecast for
Alton IL
Today
High: 89 °F
Patchy Fog
then SunnyTonight
Low: 59 °F
Increasing
CloudsSaturday
High: 82 °F
Mostly Cloudy
Saturday Night
Low: 57 °F
Mostly Cloudy
Sunday
High: 83 °F
Sunny
Sunday Night
Low: 59 °F
Mostly Clear
Columbus Day
High: 93 °F
Sunny
Monday Night
Low: 67 °F
Mostly Clear
Tuesday
High: 89 °F
Sunny
Detailed Forecast
Today
Patchy fog before 8am. Otherwise, sunny, with a high near 89. Light southeast wind becoming south 6 to 11 mph in the morning.
Tonight
Increasing clouds, with a low around 59. Southeast wind 5 to 8 mph.
Saturday
Mostly cloudy, with a high near 82. Southeast wind 5 to 9 mph.
Saturday Night
Mostly cloudy, with a low around 57. East wind 5 to 9 mph becoming light after midnight.
Sunday
Sunny, with a high near 83. Light and variable wind becoming northwest around 6 mph in the morning.
Sunday Night
Mostly clear, with a low around 59.
Columbus Day
Sunny, with a high near 93.
Monday Night
Mostly clear, with a low around 67.
Tuesday
Sunny, with a high near 89.
Tuesday Night
A 20 percent chance of showers after 1am. Mostly clear, with a low around 61.
Wednesday
A 40 percent chance of showers. Partly sunny, with a high near 84.
Wednesday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 63.
Thursday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 82.
Additional Forecasts and Information
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Point Forecast:
Alton IL
38.93°N 90.16°W (Elev. 505 ft)
38.93°N 90.16°W (Elev. 505 ft)
5:01 am CDT Oct 9, 2026
5am CDT Oct 9, 2026-6pm CDT Oct 15, 2026
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