​More heat and humidity are ahead for golfers and spectators as the third round of the 2026 U.S. Senior Open unfolds at Scioto Country Club in Upper Arlington, Ohio, with a likelihood of scattered thunderstorms across the weekend. The first two rounds, held on July 2 and 3, were marked by oppressive heat. The latest Upper Arlington forecast for July 4–5 from The Weather Channel calls for Saturday, July 4, to feature scattered clouds with a chance of thunderstorms, a high near 91 degrees, and about a 24% probability of rain. Sunday, July 5, is also expected to bring scattered clouds and thunderstorms, a high around 86 degrees, with roughly a 45% chance of rain. This article originally appeared in The Columbus Dispatch: U.S. Senior Open 2026 weather: Latest forecast for Scioto for Round 3.