Faraway Lad

Hoping someone a bit more experienced than me can help.

I can find average temperatures and humidity for the ports we are visiting n March (Singapore, malaysia Cochin Mumbai and Dubai.

What I can't find out is by how much (if any) those temps drop once out in the Bay of Bengal and the Arabian Sea.

Is it going to feel as hot and muggy as on land or will there be some nice cooling breeze

Our second cruise and the first on Royal Caribbean. Was wondering if someone could help us work out when the Formal nights are likely to be.

We sail from Singapore on the 3rd March, go to Penang on the 4th then have three sea days before arriving at Cochin. One more seas day then Mumbai. then sea days until we arrive and disembark at Dubai.

Any hints would be useful