The act of the sun going down in the evening during the summer.
Summersetting is often seen as a peaceful and beautiful time of day.
Examples:
I love watching the summersetting.
The summersetting is so pretty.
We always go for a walk during the summersetting.
The summersetting makes the sky turn orange.
The summersetting is like a painting in the sky.
Let's have a picnic during the summersetting!