Weather in Bangladesh

Bangladesh Weather: Climate Guide and Best Time to Visit

Bangladesh sits in the heart of South Asia, where the Bay of Bengal shapes nearly every aspect of the country's weather. The nation experiences a classic tropical monsoon climate — hot, humid, and defined by dramatic seasonal swings that transform the landscape from lush green delta to rain-soaked floodplain and back again. Understanding these patterns is essential whether you're planning a visit or simply trying to make sense of the Dhaka weather forecast.

The Four Seasons of Bangladesh

Unlike temperate countries with four even seasons, Bangladesh follows a rhythm driven by monsoon winds. The year broadly divides into four phases: a warm and dry winter, a hot pre-monsoon spring, the intense monsoon summer, and a brief pleasant post-monsoon autumn.

Winter (November to February) is the most comfortable time of year. Temperatures are mild, humidity drops, and skies clear. In the north, around cities like Rangpur and Comilla, nights can turn noticeably cool. Southern coastal areas remain warmer year-round. This is peak season for travellers.

Pre-monsoon (March to May) brings rapidly rising heat and humidity. March is warm but manageable; by April and May the heat becomes oppressive, with temperatures regularly climbing into the high thirties Celsius across the country. Thunderstorms called nor'westers — locally known as Kalbaisakhi — sweep across the region, bringing brief but violent downpours and sometimes hail.

Monsoon (June to September) is when Bangladesh truly earns its reputation as one of the world's wettest countries. The southwest monsoon arrives in June and delivers the overwhelming majority of the country's annual rainfall. Rivers swell, vast areas flood, and the delta comes alive. The Chattogram weather during this period is especially dramatic, as the port city sits exposed to Bay of Bengal weather systems and receives some of the heaviest rain totals in the country.

Post-monsoon (October to November) sees the rains retreat but humidity lingers. October can still bring cyclones forming in the Bay of Bengal — Bangladesh is historically one of the most cyclone-affected coastlines in the world. By November the air clears and the pleasant winter sets in once more.

Regional Variation Across the Country

Bangladesh is a small country geographically, but climate varies more than you might expect. The northwest is the hottest and driest region; the northeast — including the Sylhet hills — is among the wettest places on the subcontinent due to orographic rainfall. The Sundarbans mangrove coast in the southwest, near Khulna, experiences a slightly moderated maritime climate. In the rapidly urbanising industrial corridor around Gazipur, urban heat effects amplify already high temperatures during summer months.

Best Time to Visit Bangladesh

For most travellers, November through February offers the ideal combination of dry skies, manageable temperatures, and good air quality. December and January are the coolest months. If you're drawn to the spectacle of the monsoon — the vast flooded haors, the river ferries threading through submerged landscapes — June through August is genuinely breathtaking, but requires flexible plans and waterproof everything.

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