Weather
Hot and dry almost everywhere: 30–35°C in Bangkok, the Andaman calm and clear, the Gulf still pleasant. Rain is rare until the very end of the month.
The burning season
March and April are when agricultural burning peaks in northern Thailand. Chiang Mai and Chiang Rai can see hazardous air quality for days. If you have respiratory issues, go south instead.
Why we still like it
Diving is at its best — manta rays at Koh Bon, good visibility in the Similans — and hotel rates are 20–30% below January. Book the Andaman rather than the north.
