If you have the extra honey go ahead and give it to them. One frame is plenty and it will help them get their own combs built out and give them a boost when it comes to building brood. I hived package bees this year 10 of them, which isn't much diff than a swarm. I gave them each a frame with stores on it. They have took off like rockets and no sign of slow down. The drizzle won't be that bad for them, just be quick about it.