If you are dealing with a hard rain, then obviously this is not conducive to shooting. But if it's a very light rain or a drizzle, bring an umbrella and a plastic cover for your camera and look for beautiful images of buildings and neon lights reflecting in the wet streets.
The accompanying photo is the old square in Krakow, Poland. This would be a very pretty night shot at any time, but with the light rain it was especially beautiful.
Tips: Use a tripod, a low ISO like 200, the mirror lockup feature and either a cable release or the self-timer to eliminate camera vibration. Also, carry a microfiber cloth to wipe the lens of rain drops.
Learn more...Jim Zuckerman is a top pro who teaches for BetterPhoto's digital photography school, including these interactive online courses: Low Light Photography, Techniques of Natural Light Photography, and Perfect Digital Exposure. Additionally, Jim Z contributed to two books co-authored by Jim Miotke and Kerry Drager: The BetterPhoto Guide to Creative Digital Photography and The BetterPhoto Guide to Photographing Light.
Article by Jim Zuckerman. To learn more about photography, explore the many online photography and Photoshop classes offered here at BetterPhoto.com.