By May, humidity levels are usually at their highest on the West Coast of Peninsula Malaysia and the monsoon rains have normally arrived, characterized by short sharp downpours, usually late in the afternoon or early in the evening. Temperatures remain constantly high throughout the year.
On the East Coast of Peninsula Malaysia, the effect of the Northeast Monsoon has normally long gone and May should be characterized by sunny cloudless days with very little rainfall.
The dive resorts in the Perhentian Islands, Redang and Tioman Island are very popular during this time of year as the weather is perfect for diving and snorkelling.
In Borneo, May is also a perfect time to visit for long sunny days and clear skies. Rainfall is usually very low on the coast of Sabah, making this a good time for beach holidays in Borneo and for diving on the offshore islands such as Lankayan or the dive islands further south.
In Sarawak, drier weather continues, making this an optimum month for a tour of Borneo or visit to the wildlife lodges in Sabah or Sarawak.