More than 92% of the population speaks Thai or one of its regional dialects. English is spoken and understood in Bangkok, not so much in the countryside.
Thailand has a tropical climate and the temperature typically ranges from 19 to 38 degrees C (66-100F). The weather in October is usually about 25-35 degrees Celsius.
Thailand Standard time is GMT+7. Thailand does not have daylight savings.
Electrical outlets in Thailand are 220V at 50 cycles per second and feature flat, two-pronged plugs, though some feature holes for round plug ends and some three holes (grounded outlets). It is wise to bring an adapter.
The Thai phone system has comprehensive coverage for mobile phones, with a number of mobile networks available.
Emergency numbers are often three or four digit numbers, including Tourist Police (1155) and Emergency services (1669).