Most people imagine the monsoon ending like a switch being flipped. In reality, it fades out gradually. Over the season, moist winds from the south and southwest bring steady rain. As autumn arrives, the wind pattern begins to turn, and drier air from the north slowly takes over. For a few weeks, the two air masses meet and mix over the country.
That mixing is the key. When moist, warm air still lingers near the ground and cooler, drier air arrives above, or beside it, the atmosphere becomes unstable. Clouds build quickly, often in the afternoon, and release rain in short, heavy bursts. These are not the long grey monsoon days of July. They are shorter, sharper showers, sometimes with thunder and gusty wind.
The Bay of Bengal Factor
October is also a busy month for the Bay of Bengal. The sea is still very warm after the summer, and warm water feeds the air above it with heat and moisture. That makes it easier for low-pressure areas to form. When one develops, it pulls in moist air and can bring clouds and rain to coastal and southern districts, even when the rest of the country looks calm.
The Meteorological Department has warned that two to three such systems may form this month. Most will fade as ordinary low-pressure areas, but one may strengthen into a depression or cyclone. Historically, the Bay sees a second cyclone season in October and November, after the pre-monsoon period of April and May. That is why fishermen and coastal communities are told to keep an eye on the daily bulletins even when the weather looks fine.
Why It Feels Wetter Than It Is
There is an interesting detail in this year’s outlook. Despite the lingering showers, the department expects total October rainfall to stay below normal. So why does it feel so rainy?
Part of the answer is how the rain falls. A few intense downpours can make a whole week feel wet, especially in a city with weak drainage. Dhaka can see roads flood within an hour of heavy rain, even if the monthly total is modest. Another part is the humidity. Even on dry afternoons, the air stays sticky, with warm temperatures that feel heavier than the thermometer suggests. The sky stays cloudy more often, which adds to the sense of a lingering monsoon.
What October Means for Daily Life
For commuters, October means carrying an umbrella well after the monsoon officially ends. Afternoon storms can arrive with little warning, so mornings may look bright while evenings turn grey. In cities, waterlogging can slow traffic and disrupt schools and offices for a few hours.
For farmers, late showers are a mixed blessing. The rain helps late-planted crops and keeps soil moist, but heavy bursts can damage standing fields and delay harvesting. Temporary rises in river water are also possible in the north, northeast and southeast after heavy rain, even though major rivers are expected to flow normally overall.
For coastal areas, the main concern is the sea. Signals raised for fishing boats and trawlers should be taken seriously, because a low-pressure area can strengthen faster than expected.
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When Will It Truly Turn Dry?
Once the monsoon fully withdraws, the pattern usually shifts. Skies become clearer, humidity eases, and nights start to cool, especially in the north. This is the period many Bangladeshis welcome as the beginning of autumn and then early winter. Still, the transition is not instant. Expect a few more scattered showers, and keep one eye on the Bay, since a cyclone can bring heavy rain even after the monsoon is gone.
Simple Tips for the Weeks Ahead
Check the Met Office forecast before travelling, particularly to coastal districts. Keep a compact umbrella or raincoat handy. Avoid low-lying roads during heavy rain. If you farm or run a small business that depends on the weather, follow district-level warnings rather than only the national forecast.
