Muyabia Labony; Dbarta24 — Although Bangladesh is expected to see overall normal rainfall during August, the Bangladesh Meteorological Department (BMD) has warned of potential low-pressure systems, localized heatwaves, and short-term flooding in several regions.
In a long-term forecast press release signed by Md. Azizur Rahman, Director (Current Charge) and Chairman of the BMD Expert Committee, the Met Office detailed the synoptic weather conditions anticipated throughout the month.
Key Weather Developments for August
The Met Office forecasts that one to two seasonal low-pressure systems are likely to form over the Bay of Bengal this month. At least one of these systems could intensify into a monsoon depression.
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Thunderstorms & Heatwaves: Across the nation, 5 to 6 days of light to moderate thunderstorms are expected. Additionally, one or two mild-to-moderate heatwaves could sweep across parts of the country, keeping both daytime and nighttime temperatures slightly above average.
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Sunshine & Evaporation: Daily average evaporation rates are projected to range between 2.5 mm and 4.5 mm, with average daily sunshine duration estimated at 5.5 to 6.5 hours.
River Conditions and Flood Risks
Heavy rainfall events could trigger short-term flash floods across vulnerable regions, including:
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Northern Bangladesh
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North-Eastern Bangladesh
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South-Eastern Hilly Districts
Water levels in major river systems across the country are expected to rise overall throughout the month due to sustained rainfall in upper catchment basins.
July Weather Review: Record Rainfall Across Divisions
The August outlook follows an extraordinarily wet July. According to BMD analysis, Bangladesh recorded 35.6% higher rainfall than normal nationwide in July:
| Division | July Rainfall Deviation from Normal |
| Chattogram | +59.0% (Highest division-wide increase) |
| Sylhet | +37.3% |
| Mymensingh | -0.05% (Slightly below normal) |
During July, three low-pressure systems formed in the Bay of Bengal, two of which developed into monsoon depressions.
The country’s highest recorded temperature in July reached 37.5°C in Rajshahi on July 4, while the lowest temperature dropped to 22.0°C in Sylhet on July 21 and 22. Chattogram logged the country’s heaviest single-day rainfall on July 8, recording a massive 329 millimeters.