Patna: The monsoon remained active across Bihar on Sunday, with the India Meteorological Department (IMD) issuing a yellow alert for rain and lightning in 20 districts and forecasting further rainfall in parts of the state over the coming days.
The IMD said the current spell of rain is expected to continue until August 12, with heavy rainfall possible in parts of North Bihar. Weather conditions are likely to improve across the state after August 15.
Despite the recent showers, Bihar has received significantly less rain than normal this monsoon. By August 8, the state had recorded 365.6mm of rainfall against a normal 566.6mm, representing a 35% deficit.
River Levels Rise In Several Districts
The continuing rain, along with rainfall in Nepal, has affected river levels in several parts of North Bihar.
The Bagmati River is in spate in Muzaffarpur, with more than 12 houses submerged in Bakuchi village.
In Bagaha, water from the Gandak River has entered around 300 houses across two panchayats.
Severe erosion by the Ganga has also begun near Mahendrapur village in the Matihani block of Begusarai district.
In Khagaria, the rising Ganga has caused water to spread into low-lying areas. A culvert connecting to Nayagaon Diyara in Parbatta block has been completely submerged, disrupting access to the area and the movement of residents.
मौसम #चेतावनी #बिहार #दिन-1 से दिन-7 तक pic.twitter.com/iPL9cWdWBp
— Mausam Bihar- IMD Patna (@imd_patna) August 8, 2026
Heavy Rain Forecast For August 13-14
The Meteorological Department has forecast scattered rainfall in parts of Bihar between August 8 and 12, while rainfall activity is expected to remain broadly normal across most areas.
Heavy rain has also been forecast in parts of the state on August 9.
More intense rainfall is expected on August 13 and 14, when rising river levels could add to the flood risk in some districts.
A yellow alert for heavy rain and strong winds has been issued for 19 districts for August 13-14, including Jehanabad, Saran, Siwan, Buxar, Gaya, Patna, Begusarai, Samastipur, Darbhanga, Madhubani, Purnia, Kishanganj, Araria, Saharsa, Supaul, Khagaria, Bhagalpur and Lakhisarai.
Rainfall Deficit Uneven Across Bihar
The overall rainfall deficit masks significant differences between districts.
West Champaran has recorded 117.1% excess rainfall, while Siwan has received 14.1% more rain than normal. Sheikhpura has recorded a 68% surplus.
Several other districts, however, remain severely rain-deficient. Arwal, Aurangabad and Rohtas have received very little rainfall so far, while Kaimur, Buxar, Bhojpur, Nawada, Jamui, Banka, Kishanganj, Araria and Madhubani have recorded rainfall substantially below normal.
The contrasting rainfall patterns mean that while some parts of Bihar are dealing with rising river levels and waterlogging, other districts continue to face a significant monsoon shortfall.
