The Capital star, 24, produced one of the quickest times of his career of 1:45.96 but was adrift of Kenya’s Emanuel Korir who claimed the overall title.
With European and Commonwealth medals from 2018, it’s been a year of progress for Wightman who now will run the New York Mile next week after a surprising snub from Europe’s team for the Continental Cup in Ostrava.
“I’d have liked to have been selected for the Continental Cup but they took the top two in times rather than medals from the Europeans,” he said. “But I’ll have one more race after this in New York and then take a break.”
Laura Muir delivered a brilliant run in the 1500m to take victory – and her second Diamond title in three years. While Wightman’s Edinburgh AC club-mate Lynsey Sharp rounded off her campaign by winning the non-Diamond League 800 metres in 1:59.93.
“Even if it wasn’t’ a Diamond race, I’m very satisfied about this victory,” Sharp said. “I hadn’t come here since 2014 and it’s still one of my favourite meetings. The pacemaker was good but I had to take the race in charge. Today, my legs were in good shape and it was great to end this season with that kind of victory, with my season’s best.”