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No, @Tony2046 is right. The ball wont be colder, it will just get cold quicker if it's wet. You can't make the ball colder than it's surroundings.
You absolutely can make the ball colder than its surroundings when it is wet. The ball has the potential to cool down below the air temperature until it reaches the dew point temperature. The evaporating water carries heat away from the ball.
Now admittedly on a rainy day the air temp and dew point temp are going to be pretty close to each other if not practically equal, of course. But say it was dry air and you were playing on a previously-watered or rained-on field that hadn't had the time to dry off out yet and the ball got soaked from the wet field. Then there could be a meaningful gap between air temp and dew point temp and the ball could cool below the air temp.