The first thing you will want to do, in order to keep yourself safer when driving in the rain, is to slow down, realizing that the fresh water mixed with the oil that typically sits on the street can cause the streets to become far more slick than usual; at the same time, however, keep in mind the fact that there will be others who will not slow down as much as they should when it is raining (in fact, there are those who will continue driving well over the speed limit, in spite of the slick streets!), and because of this, you will want to make sure you are not slowing down too much, lest you become a hazard on the road.
In recognizing that many others will not take the same precautions as you when it is raining, you should also realize that this means you will need to be cautious for them, as well as for yourself; pay close attention when you are driving in the rain, making sure you are watching everything, and that you are not multitasking!
And when you are driving in the rain, one of the most important things for you to realize is that using cruise control when the streets are slick is incredibly unsafe, as you will greatly increase the likelihood of sliding off the road if you need to use your brakes when you are in cruise control; even though it might be more work, leave the cruise control off until you get back on dry roads.
As you remember these things when driving in the rain, you will be able to keep yourself safe, and will avoid the bad wrecks so many others get into because of their carelessness when driving in the rain.