Wet bees are not happy bees.
Here's what to do if you are incredibly soft-hearted like I am, and find one.
www.photgraphyblog.com Megachile perihirta (male)
http://macrojunkie.deviantart.com Megachile perihirta (male) - these guys clearly get stuck in the rain a lot :)
I'm kidding about the rain. It is glorious... Mostly because we need it desperately.
But it's terrible for bee watching.