There is very little chance of rain, though it can happen during El Nino years. Even then, it won't amount to much. The prevailing wind is from the Northeast . The other side of the Malay peninsula is experiencing their rainy season. This month is the same as January as far as weather and crowds go.
Many orchids are in bloom towards the end of the month.
The migratory birds are still here. March High season is tapering off this month. There seems to be less people and negotiating on prices is possible, especially with street vendors and small shops. It gets a little hotter at the end of the month sometimes. There are occasional brief showers some years.