Officers are reminding motorists to check the weather forecast and road conditions before setting off, and to allow extra time for journeys if conditions are poor.
They also advise delaying travel if the weather becomes severe.
A spokesperson for Traffic Wales said: “Driving in wet conditions can be hazardous, be safe, and prepare for wet weather.
“Use headlights when visibility is reduced.
“Regularly check your windscreen wipers and renew them if they’re worn or damaged.
“Give yourself the best chance of being able to see clearly in wet weather.
“Double the distance you leave between your car and the car in front of you, as stopping distances are increased by wet roads.
“If steering becomes unresponsive due to the rain, ease off the accelerator and slow down gradually”.
Drivers are also being urged to double the distance between their vehicle and the one in front, as stopping distances increase on wet roads.
If steering becomes unresponsive due to rain, officers advise easing off the accelerator and slowing down gradually.
Traffic Wales are warning drivers not to attempt to drive through fast-moving water, such as at a flooded bridge, as vehicles can easily be swept away.
They also recommend avoiding standing water where possible and adjusting speed to suit the conditions.
Aquaplaning, where tyres lose contact with the road, can cause a loss of control.
If this happens, drivers should hold the steering wheel lightly and lift off the throttle until grip is regained.
Driving through water at anything above a slow crawl can splash pedestrians or cyclists, which could result in a fine and between three and nine penalty points if police believe the driver was inconsiderate.
It can also damage your car.
The spokesperson explained: “Driving through water at speeds above a slow crawl can result in water being thrown onto pavements, soaking pedestrians or cyclists.
“You could face a hefty fine and between three and nine penalty points if the police believe you were driving without reasonable consideration for other road users.
“If you should find yourself driving through standing water, use a low gear so the engine rev’s are higher; water in the exhaust could otherwise damage the catalytic convertor.
“If you break down in heavy rain don’t prop the bonnet open while you wait for the patrol to arrive. The engine will be more difficult to start again if the electrics are all rain-soaked”.
