Here is the forecast for the Iowa State Fair for Friday August 8th in Des Moines.
NWS Sunny High: 83°
WX Underground Partly Cloudy High: 83°
KCCI-TV Sunny High: 83°
WHO-TV Partly Cloudy High: 83°
WOI-TV Mostly Sunny High 83°
Weather Channel Sunny High: 82°
Accu Weather Partly Cloudy High: 86°

Iowa WX Blog’s Forecast, Sunny with a few afternoon clouds. High 83° a light SE breeze under 10mph. (There is a chance of rain Friday night but it should hold off until after the fair has closed for the night)