Here is the forecast for the Iowa State Fair for Thursday August 7th.
NWS (National Weather Service) Mostly Sunny High: 84°
WX Underground.com Partly Cloudy High: 83°
KCCI-TV 8 Des Moines Sunny High: 84°
WHO-TV 13 Des Moines Partly Cloudy High: 84°
WOI-TV 5 Des Moines Mostly Sunny High: 84°
Weather Channel Mostly Sunny High: 83°
Accu Weather Partly Sunny High: 84°

Iowa WX Blogs Forecast will be Partly to Mostly Sunny with a high around 84° Light wind out of the NW at 5-10 mph. You will need to put on your SPF 15 because there will be ample sunshine and sunburns could occur in less than 30 minutes.