Can vampires show themselves in broad daylight?

This depends what type of vampire you are talking about. Traditional vampires cannot go out in broad daylight or they will turn into a pile of ashes. The vampires from the Twilight saga can go out in broad daylight, just not in front of humans because the vampires sparkle in the sunlight.

It use to be that vampires had no problem going about in the daytime. Varney the vampire, Count Dracula and Camilla all went out during the day. It wasn't till 1921 when the movie Nosferatu came out (Count Orlok) that vampires had a problem with sunlight.