Not much change from April, with May remaining very hot as the mercury reports frankly unnatural figures at times! Visitor numbers start to decline, making this month a very agreeable time of year to visit if you're a serious sun worshipper. Temperatures do tend to start to dip a little towards the end of the month (monthly range from 32 - 38°C), and for most travellers this is welcome.
Heavy rains are just around the corner, so you can expect showers in many parts of Myanmar during May, and it is likely (again towards the end of the month) that a breeze will pick up, helping to cool the land.
The central plains to the south of Mandalay don’t fall in with the rest of the country, and remain dry and with temperatures that remain astronomical, touching 40°C at times. The beaches stay hot and dry, although the ‘season’ comes to an end in May, with resorts battening down the hatches in preparation for the less favourable weather in the coming months.
You may be wondering whether you should be travelling to Myanmar. It's a complex situation, and Selective Asia's Gemma has shared some insightful thoughts on travelling responsibly in Myanmar - you can read them here.