A Few years ago I helped a friend of mine move his yacht from Oman to
Malaysia.... which is effectively what you are going to do.
We left Early March - our
route was Muscat -> Cochin, then Cochin->Langkawi
The
weather in the Gulf to Cochin was lousy for sailing - we spent much more time without
wind than was comfortable. However with limited
Diesel we just had to wallow around.
After Cochin and rounding Sri Lanka, I believe the winds picked up.
Total Sailing time was 28 days !!! 32ft Yacht.
The Yachties in Malaysia/Thailand all used to (pre pirates) sail towards Salalah (southern Oman) and then to Aden after 1st Jan - So that would be the best time I believe for you to
head that was also.
Summer time would be horrible - due to the Monsoon in the gulf,
India and unpleasant unreliable
weather in Malaysia.
Hope this helps.