Here is the forecast for the Iowa State Fair for Friday August 21st.

NWS: A 20 percent chance of showers. Mostly cloudy, with a high near 70°. Breezy, with a northwest wind between 11 and 16 mph, with gusts as high as 23 mph.
WX Underground: Mostly cloudy. A chance of showers in the morning…then a slight chance of light showers in the afternoon. High around 70°. Northwest wind 10 to 15 mph with gusts to around 25 mph. Chance of showers 30 percent.
WHO-TV: Plenty of Clouds with Showers around Midday 72°
KCCI-TV: Mostly Cloudy with 30% chance of Showers in the afternoon 71°
ABC5: Isolated Showers east otherwise Passing Clouds 73°

Grade: C The showers will be very isolated and will be more likely in the afternoon hours. Any shower that rolls through will not last too long.