When the topic of lightweight summer quilts comes up, many quilters think of quilts without batting. Simply “quilting” together a quilt top and a backing fabric, or two sheets, is one way to make a summer quilt.
Another method, which you may prefer if you like a little loft to your quilt, is to substitute a flannel sheet for the batting. Just be sure to wash it several times so it won’t shrink substantially when the finished quilt is washed.
Flannel for the batting gives the quilt a bit of that snuggle factor and is often just right for summer nights. Plus, that will prevent colors from the quilt front and backing from showing through on the other side.
Lightweight batting is another option to consider. While there are several on the market, some will be less warming than others. A lightweight cotton batting may not be the coolest choice.
Another consideration for summer quilts is the fabric used in making them. Fabrics from some manufacturers are naturally thinner, and cooler, than others. But have you considered fabrics other than quilting cotton?
The following article from Craftsy gives a nice overview of fabrics and batting for lightweight summer quilts.
Be sure to read through the comments section for more tips.