Bihar Weather Alert: Bay of Bengal Depression to Trigger Heavy Downpours

• by Akanksha Mishra
• 2026-09-20 16:53:00

Following a noticeable lull in regional monsoon activity over the past twenty-four hours, the India Meteorological Department (IMD) has forecast a dramatic weather turnaround across Bihar driven by a cyclonic formation brewing over oceanic waters. The Patna Meteorological Centre confirmed that while most districts experienced hot, humid, and largely dry weather over the weekend, a developing low-pressure system over the North Andaman Sea and adjoining Eastcentral Bay of Bengal is rapidly gaining momentum. As the system tracks west-northwestward, it is projected to intensify into a depression by September 21 and escalate into a deep depression by September 22, setting the stage for widespread rainfall, thunder, and lightning activity across Bihar beginning September 23 and 24.

Past 24-Hour Review: Peak Heat in Bhabua and Isolated Showers Across Districts

Over the last 24 hours, regional climatic conditions showed substantial heat accumulation across southern and western belts, with Bhabua in Kaimur logging the state's highest maximum temperature at 37.1°C, while Valmiki Nagar in West Champaran recorded the lowest minimum temperature at 24.4°C. State-wide maximum daytime temperatures hovered between 31.8°C and 37.1°C under scattered cloud cover. Rainfall remained restricted to sporadic pockets, with Dehri in Rohtas recording 21.6 mm, Hajipur receiving 21.4 mm, Adapur/Adhwara logging 18.6 mm, Matiyani measuring 15.6 mm, and Gaya clocking 13.0 mm alongside strong surface wind gusts reaching up to 35 km/h.

District-Level Forecast: Immediate Thunderstorm Watch and Expected Temperature Dip

For immediate monitoring, meteorologists have cautioned that northeast districts—including Supaul, Araria, Kishanganj, Purnia, and Katihar—alongside southeast pockets such as Bhagalpur, Banka, Jamui, Munger, and Khagaria, face heightened risks of lightning strikes, thunderclaps, and localized gusty winds blowing at 30 to 40 km/h on Sunday evening. While conditions on Monday, September 21, will remain comparatively calm with no statewide severe warnings, day temperatures will hold steady between 32°C and 36°C over the coming 48 to 72 hours. Once the deep depression unleashes sustained rainfall between September 24 and 26, daytime mercury levels are expected to drop noticeably by 2°C to 4°C, bringing significant cooling relief, while nighttime minimums will stabilize between 24°C and 28°C over the next five days.

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