Driving on wet roads with your cruise control on can be very dangerous. Why? If your car begins to hydro-plane and tires lose contact with the surface, the cruise control will take some time to react. When your car begins to get traction again, it will accelerate, making you take off too quickly. You may lose complete control of your vehicle.
The early part of the rainy season is especially hazardous. It hasn’t rained in a long time and oils have accumulated, making it difficult for your tires to stick to pavement. Some newer cars won’t let you set cruise control while the windshield wipers are on. The safest thing is to avoid using the cruise control setting when rain and inclement weather are in the forecast. Also, be sure to replace worn tires before the first downpour.