Usually mornings have the calmest wind and waves, but that varies based on the weather report for the day. Generally speaking we recommend mornings. Mid-day is usually hotter and some people prefer that.
Really, any time is great to parasail if the weather is even decent and if it’s convenient for your schedule. We do recommend aiming to reserve for the beginning of your trip in case of a bad weather day, so that you at least have the option of rescheduling for another day if the weather gets bad. Remember that we don’t usually cancel for temperature or clouds, just unsafe conditions like thunderstorms or extreme winds.