I have 100,000 miles touring and the evening can be quite nice.
That said, the day is not evenly heated between morning and evening.
On hot days the best time to ride remains the morning - maybe until 11:00a.
It doesn't cool down to the 11:00a temperature often until AFTER sunset.
I did a fundraiser X-USA ride in 1988 - when it was 100+ through Missouri and Nebraska.
I would start before sunrise and quit by 11:00a.
Sometimes, I would ride an hour or so at twilight.
That gave me about 6 + 1 hours.
Also, in certain places, evening riding is magical.
I love to ride in the evening at national parks that have hiker/biker campsites.
I really don't have to worry about a place to camp.
Traffic is low - and it's the best time to see wildlife.
But the very best to ride - always - is early morning.