 Here's your Wild Horse Resort and Casino weather update for the Columbia Basin. It will be sunny and hot today. Expect a high near 99 in the Roundup City, 101 in Hermiston and Walla Walla. Tonight, it will be mostly clear. However, there's a slight chance of thunderstorms before 11 p.m. Expect a low around 57. For news, weather and more, go to ElkhornMediaGroup.com or download the Elkhorn mobile app.