The last Monday of July felt more like the middle of September with temperatures in the middle to lower 70s. Along with the cool air, skies remained dry. The dry skies will last for quite some time.
Here's the set-up. The upper layers of the atmosphere are currently splitting South Dakota in half: the trough with the cool air in the east and the ridge with the warmer air in the west. Over the next several days, this will slowly move east eventually, bringing warmer air into eastern KELOLAND. This particular set-up is not very conducive for rain as it cuts off any storm systems that would normally move in from the west.
While the seven-day forecast shows dry conditions, it will last beyond that. Some indications are showing it could last through the middle of August.