Can you please tell me the best lightweight batting for a summer quilt?
Thank you.

Check with your local quilt shop - they can tell you the properties of each batting.

I have read here that some don't use batting. I always use poly batting. I don't make summer quilts. Someone will be along to answer your question.

I live in Florida and despite that I do not make 'summer' quilts - just quilts. I always use either an 80/20 cotton blend or an 80/20 wool blend. Cotton and wool both breathe. So they are appropriate for both warm and cool locations. Some people think of a 'summer' quilt as having no batting at all - just 2 layers of fabric (top and back).

from a quick google search on "summer weight quilt batting" I came across these fine suggestions:

• a layer of flannel as batting
• a sheet as batting
• no batting layer at all

We live in California, not on the coast. Up in the Sierra Nevadas. Summer is DRY. Wool in the dry summer heat feels scratchy against the skin. I love it in the winter, especially if it's a damp day. Don't know how it would work in the dry summer sandwiched in a quilt.

Is it to used as decoration on a bed? For a summer blanket?

Just this past Saturday, a lady was demonstrating a pieced tablecloth. She serged the seams and mitered the edge to fold back instead of binding. It was thin like most tablecloths and draped beautifully. No need for a backing. The seams were thin so that glasses didn't tip. I think this could be an answer for a pieced spred for summer.

I have noticed that my quilts with 80/20 batting keep us cool in the summer and warm in the winter. Same quilt. I live in Florida.

I want to say theremore is the thinnest but keep in mind people use AC so regular cotton batting might be fine. I usually slee[ under my sheet and one quilt with cotton batting, I use the AC because southern ca can be in the hundreds sometimes and I am fine sleeping under my regular quilt with a thin cotton batting

A layer of flannel would work, or if you can get the Quilter's Dream cotton, the lightest weight, request is nice for
a lighter weight quilt.

My inlaws who have been quilting for ages don't use batting in summer quilts. I also have a few "old" quilts here where the batting has "vanished" due to washings/dryings/age and they still look great!