Weather and clothing 

The weather in Singapore in October is generally hot and moderately humid, with temperatures ranging from 26°C to 32°C. At this time of year, rainfall is to be expected. We suggest you pack an umbrella.  
Whilst you will experience warm and humid weather at this time of year, as meeting rooms are heavily air conditioned, we recommend bringing a jacket to wear during meetings. 
Business attire is expected for business meetings in Singapore.