Bangladesh features a tropical monsoon climate with high temperatures, extreme humidity, and heavy seasonal rainfall, making it predominantly Aw (tropical savanna with dry winter) in the south and Cwa (humid subtropical with dry winter) in the north. About 80% of rain falls during the June-September monsoon, driven by the Bay of Bengal and Himalayan foothills. Summers are oppressively hot at 38-41°C, while winters are mild at 10-20°C daytime. High humidity persists year-round, with frequent cyclones and flooding posing risks for residents. Expats should prepare for heat stress, waterlogging, and six distinct seasons: winter, pre-monsoon summer, monsoon, post-monsoon, and late autumn.