If you know they have water, they are just drooping to conserve water while in the hot sun. Mine do that all the time.

Check your drainage holes to make sure they are present, and that the roots haven't grown through and plugged them up. Usually they droop really bad if they
a) need water
b) the roots have been sitting in water and they are getting root rot therefore not able to absorb water into thier leaves or
c) Sometimes if it is super hot they will still droop a little but bounce back in the evening. Brugmansia leaves are large and they lose moisture through thier leaves when it is hot so sometimes they cannot absorb enough water to match its output when really hot. The key to telling if it is a C) situation is: Are the leaves bouncing back in the evening?
Hope this helps

Most of my brugs like morning sun until around 1pm or so, then they get shade...They all face east...They used to droop REALLY bad before I figured out they were in too much sun.

knotz

Yes to what Lynette said.

Are they in pots???? If so, the large leaves cause any rain to run off the leaves beyond the rims of the pots so that even though it poured, the soil itself in the pot may have gotten only minimal moisture. ( another good reason for planting your Brugs in the ground :) )

I have to water my brugs that are in pots twice. Unless we get a real downpour. If i had anyplace to put them in the ground, they would be there. They all grow in full on Texas sun.

Mine get afternoon shade- just certain varieties will droop before the sun goes behind the trees. Perfectly normal behavior!

I'm so glad you asked this question. I've wondered about this very topic. I've suspected (c) myself. The leaves are pretty thin, which probably contributes to the droop phenomena.