According to my research about visiting Mauritius, I have observed the below:

• Shoulder Seasons (April-May, Sept-Oct): Perfect weather, fewer crowds, good for exploring & water activities.
• Peak Season (Nov-March): Hottest & sunniest, ideal for beach lovers & divers, expect crowds & higher prices.
• Winter (June-August): Cooler, fewer tourists & potentially lower costs, good for budget travelers & occasional rain (especially east coast).

You can however get your study done before planning the visit.