Here is the forecast for the Iowa State Fair in Des Moines for Monday August 11th

NWS Mostly Sunny High 80°
WX Underground Partly Cloudy High 79°
WHO-TV Partly Cloudy High 80°
WOI-TV Increasing Clouds High 82°
Weather Channel Partly Cloudy High 81°
AccuWeather Partly Cloudy High 82°

Iowa WX Blog’s Forecast: Mostly Sunny with increasing clouds later in the day. High 81° Winds South at 5-10 mph. There will be late night thunderstorms Monday night and they could effect the activities at the Iowa State Fair mainly after 10pm.