Don't be smelly....but don't overpower a woman either. Your scent should follow you into a room, linger, and dissipate when you make your exit. If you smell it, it's too much. If people are waving their hands when you walk around [but not waving at you], then you're wearing too much.
Here's the body chemistry scoop: in the warmer weather, you sweat more and that changes the interaction of your scents. Lighter scents with notes of citrus, for example, respond favorably to warmer weather.
Based on a very unofficial poll, Issey Miyake garnered lots of ooohs. There are endless options depending your preference but, here's what hot with some haute ladies I know: