Meteorological Analysis & Climate Guide
Sylhet DivisionUnderstanding weather today in Sylhet Division requires a closer look at the geographical and meteorological forces governing Bangladesh. Situated in the fertile Bengal basin, Sylhet Division experiences a distinct sub-tropical monsoon climate. The daily weather forecast is heavily influenced by seasonal wind shifts between the dry continental air mass of the Himalayas to the north and the warm, moisture-laden maritime currents flowing from the Bay of Bengal to the south.
Seasonal Dynamics: From Summer Heatwaves to Monsoon Deluges
Across Sylhet Division, the annual meteorological cycle revolves around three principal seasons:
- Pre-Monsoon Summer (March to May): Characterized by rising daytime temperatures often exceeding 35°C to 40°C. In this period, intense solar heating generates strong thermal updrafts, creating violent pre-monsoon convective thunderstorms known locally as Kalbaishakhi (Nor'westers).
- Southwest Monsoon (June to October): Accounting for over 75% of annual precipitation, the monsoon season brings sustained cloud cover, continuous rain bands, and elevated relative humidity averaging 80% to 90%. RealFeel® temperatures during this season frequently register several degrees above thermometer readings.
- Dry Winter (November to February): The most pleasant season in Sylhet Division, marked by mild sunny days, cool crisp evenings, and refreshing north-westerly breezes. During peak winter (December and January), sub-Himalayan cold waves periodically sweep through, bringing morning radiation fog.