Lincoln has been near the boundary of the NW-SE divide over the last few days, it was very sunny on 12 June, but 10,11 and 13 June had a fair amount of cloud at times. The 10th was the cloudiest day, though the cloud did conveniently break up during the eclipse. Overall though sunshine amounts have felt quite decent, and it's certainly been warm.
High Summer temp categories here in central they could be described as “hotter” but when compared to averages they’re quite unremarkable a 30C day is far from unusual +6C warmer than average a 14C day in winter would think nothing of it. Personally 30C is quite comfortable with little exertion and low humidity it’s when it exceeds 32C regardless it’s hot and you feel it in London.