Sub-equatorial monsoon and tropical. The two main seasons - winter (October-February) and spring-summer (March-September, known in Bangladesh as "a little rainy season"). Spring-summer season - a period of strong tropical rains, which are almost on a daily basis. There is also a "cyclone season" - from May to June and from October to November. The average January temperature is +12-25 C, April (the hottest month) 23-34 C. The annual precipitation - 2000-3000 mm., In the north-east of the country - up to 5000 mm. About 80% of precipitation falls in the cyclone season from May to mid-October. During the rainy season, and bottling river delta undergoes severe flooding. Best time to visit Bangladesh - the cold season from October to February, when the weather is dry and quite prohdadnaya. We do not recommend visiting in April, when humidity and high temperatures make the stay unbearable.