Thailand's tropical climate is characterised by high temperatures and humidity throughout the year. April and May feature the hottest temperatures while the weather in June sees the monsoon pattern bringing heavy rain through to October.
November to February is the best time to visit Thailand as the weather is relatively mild and sunny with humidity levels dropping and temperatures cooling from the North East breeze. Thailand's average climate ranges from 30°C at its lowest in December and up to 36°C from January to April. Rainfall generally averages from 5mm in December to 300mm in September in central parts of Thailand.
Light cotton clothing that is not too revealing is recommended year round when visiting Thailand. There are also plenty of retailers who can recommend and provide suitable clothing at an affordable price.