Sri Lanka East Coast Water Temps in April / May

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Does anyone have any record, link or information regarding water temperatures off the east coast of Sri Lanka in April / May period?

I am traveling to Batticaloa at the end of April to dive HMS Hermes with some tech buddies.

All dives will be deco dives on trimix

 

[MasterChief D]

Saw this (Water Temperature - Batticaloa, Sri Lanka) not sure how accurate it is.

Checked the temps the website mentions for a couple of other places in Sri Lanka I've dived in against my logbook and they are very close...

 

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Thanks D