Alton Wind ForecastUnited StatesIASioux CountyAlton1-Day3-Day5-Day Graph Plots Open in Graphs Wind Forecast NOAAWind Real-Time Alton wind forecast issued today at 9:28 pm. Next forecast at approx. 9:28 am.Alton Wind Statistics June WindLe Mars Municipal Airport (16.8 miles)2026MayJuneStrongest – Average June–Strongest 12 May, 202628.9mph NWAverage May9.4mphStrongest 21 January, 202631.1mph WNWAverage 202610.4mphClimate (2010–Present)Le Mars Municipal Airport (16.8 miles)Take a look at our website widgetsAvailable free! Find Out MoreStrongest 23 April, 202242.5mph SSWAverage 2021–202610.1mphGet WillyWeather+ to remove ads