Alton Airport (ALN) 15 Day Weather Forecast, Alton United States
Current weather conditions and 15 day weather forecast for Alton Airport in Alton, United States including weather daily high/low temperature, warnings, chance of precipitation, pressure, humidity/wind chill, rain, wind speed, cloud, pressure, and UV index.
Current weather conditions at ALN
| 19 September 2026 Sat 23.1 ° C ( 73.5°F )  Patchy rain nearby |
Feels Like : 25.5 ° C / 77.9°F Humidity : % 92 Pressure : 1014 mb Wind Speed : 11.5 kmph / 7.2 miles from SE 
Visibility : 10 km Precipitation (rainfall) : 0.04 mm Cloud (%) : 74 |
15-day weather forecast for Alton Airport, Alton, United States
| Date | Weather forecast | Low temperature | High temperature | Average Temperature | Humidity | Wind | Chance of rain |
|---|---|---|---|---|---|---|---|
| 19 September 2026 Sat |  Overcast |
22.2 ° C | 32.5 ° C | 27.1 ° C | % 64 | 18.4 km/h | 36% |
| 20 September 2026 Sun | Overcast |
22.5 ° C | 32.8 ° C | 27.1 ° C | % 52 | 13.7 km/h | 36% |
| 21 September 2026 Mon | Overcast |
17.5 ° C | 29.1 ° C | 22.4 ° C | % 83 | 22.7 km/h | 84% |
| 22 September 2026 Tue | Patchy rain nearby |
13.3 ° C | 17.1 ° C | 15.8 ° C | % 88 | 16.2 km/h | 40% |
| 23 September 2026 Wed | Overcast |
12.3 ° C | 21.6 ° C | 16.9 ° C | % 70 | 16.9 km/h | 13% |
| 24 September 2026 Thu | Overcast |
12.4 ° C | 21.4 ° C | 16.7 ° C | % 64 | 14 km/h | 15% |
| 25 September 2026 Fri | Overcast |
12.9 ° C | 23.1 ° C | 17.2 ° C | % 67 | 18 km/h | 10% |
| 26 September 2026 Sat | Overcast |
12.7 ° C | 24.4 ° C | 18.3 ° C | % 64 | 13.7 km/h | 10% |
| 27 September 2026 Sun |  Sunny |
13 ° C | 26.5 ° C | 19.4 ° C | % 54 | 13.7 km/h | 4% |
| 28 September 2026 Mon | Overcast |
15.5 ° C | 27.9 ° C | 21.7 ° C | % 52 | 11.9 km/h | 8% |
| 29 September 2026 Tue |  Light rain shower |
14.9 ° C | 20.7 ° C | 17.4 ° C | % 84 | 10.8 km/h | 89% |
| 30 September 2026 Wed | Patchy rain nearby |
14 ° C | 20.1 ° C | 16.4 ° C | % 85 | 14.8 km/h | 69% |
| 01 October 2026 Thu |  Mist |
12.1 ° C | 21.5 ° C | 16.3 ° C | % 72 | 14 km/h | 11% |
| 02 October 2026 Fri | Patchy rain nearby |
12.5 ° C | 19.9 ° C | 16.2 ° C | % 77 | 17.3 km/h | 36% |
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