Usually any game in Colombo is tough due to humidity.
The toughest I played was at Radella, where temperature was about 6 celcius in the morning, with a very strong wind. The hands just keeps stinging when the ball is fielded. It was near impossible to spin the ball as it has frozen the fingers. Then bowled some dibbly dobblies and enjoyed the swing available and in the process taking a wicket.
Diuretics are used to look good at TV shows
I played for 20 years in the Lankan team, I did not have any problems as a Tamil - Muralidaran