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
| 13 September 2026 Sun 21.6 ° C ( 70.9°F )  Light rain shower |
Feels Like : 23.1 ° C / 73.6°F Humidity : % 74 Pressure : 1015 mb Wind Speed : 4.3 kmph / 2.7 miles from NE 
Visibility : 10 km Precipitation (rainfall) : 0.57 mm Cloud (%) : 100 |
15-day weather forecast for Alton Airport, Alton, United States
| Date | Weather forecast | Low temperature | High temperature | Average Temperature | Humidity | Wind | Chance of rain |
|---|---|---|---|---|---|---|---|
| 13 September 2026 Sun |  Overcast |
17.7 ° C | 30.7 ° C | 23.6 ° C | % 69 | 24.8 km/h | 69% |
| 14 September 2026 Mon | Overcast |
14.5 ° C | 27.8 ° C | 21.3 ° C | % 67 | 22 km/h | 9% |
| 15 September 2026 Tue |  Sunny |
22.1 ° C | 35.1 ° C | 26.6 ° C | % 69 | 24.1 km/h | 57% |
| 16 September 2026 Wed | Light rain shower |
21.9 ° C | 31.5 ° C | 26 ° C | % 76 | 14.8 km/h | 74% |
| 17 September 2026 Thu | Overcast |
23.3 ° C | 32.7 ° C | 27.1 ° C | % 69 | 20.9 km/h | 71% |
| 18 September 2026 Fri | Overcast |
20.6 ° C | 27.4 ° C | 23.4 ° C | % 87 | 12.2 km/h | 89% |
| 19 September 2026 Sat | Sunny |
21.4 ° C | 33.3 ° C | 25.2 ° C | % 79 | 22 km/h | 75% |
| 20 September 2026 Sun |  Patchy rain nearby |
17.3 ° C | 23.3 ° C | 20.9 ° C | % 89 | 16.9 km/h | 88% |
| 21 September 2026 Mon | Light rain shower |
14.9 ° C | 16.9 ° C | 15.6 ° C | % 96 | 24.1 km/h | 94% |
| 22 September 2026 Tue | Light rain shower |
14.9 ° C | 17.2 ° C | 16.1 ° C | % 97 | 19.4 km/h | 94% |
| 23 September 2026 Wed | Light rain shower |
16.7 ° C | 23.6 ° C | 19.5 ° C | % 92 | 17.6 km/h | 91% |
| 24 September 2026 Thu | Patchy rain nearby |
18.3 ° C | 24.6 ° C | 21.2 ° C | % 86 | 12.2 km/h | 62% |
| 25 September 2026 Fri | Sunny |
19.8 ° C | 28.1 ° C | 23.2 ° C | % 80 | 11.9 km/h | 11% |
| 26 September 2026 Sat | Sunny |
20.3 ° C | 28.1 ° C | 23.6 ° C | % 79 | 14 km/h | 9% |
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