I am in Colorado.. I planted 2 weigela couple weeks ago.. I thought was morning sun and afternoon shade .. it does but then it gets 80 degrees sun.. seems like it's drying out.. I've watered it good at the roots then wait till soil feels dr a wRer again.. why do leaves feel crunchy?? Not totally dried out tho..

Perhaps you are not watering nearly enough?
When I transplant something like this, I water it every second or third day for a couple of weeks. I water enough to make sure the entire root ball gets water. I never let a new transplant approach dryness.
After a couple of weeks, the new plant is starting to get established in its new spot. I start to cut back on watering frequency, not the amount. I cut back to maybe twice a week for a bit then maybe twice after ten days or so. Each time I really give it a really good drink. After 2-3 months I kind of figure it has made it. I water much less frequently but still be alert to very dry periods weather wise. You have to safe guard against overly warm temperatures that increase the drying rate.
Without images, I suspect you are not watering often enough or applying enough water.
Good luck.

I might suspect the material the weigela were potted in. If it was mostly peat moss then it is almost impossible to re-wet dry peat moss. If it continues to decline I would be tempted to dig it up, tease out most of the potting mix, perhaps soak the root ball in water with some transplant product, then replant.