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Last update: 08:30, 24 Aug 2026
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Rain in Purnia: What You Need to Know
Purnia weather runs on the southwest monsoon, which delivers 82% of the district's ~1,747mm annual rainfall between June and September — the highest total in Bihar state. A hyperlocal radar for Purnia matters most in July, the peak month at roughly 383mm, when the district records more than 100 rainy days a year, among the highest counts in Bihar alongside neighboring Kishanganj. RainViewer's hyperlocal radar is built to show exactly where those rainy-day cells are sitting, not just that rain is likely somewhere in the district.
The mechanism behind Purnia's flood risk is the Kosi River, known locally as the "Sorrow of Bihar" for the way it shifts its own course between Purnia to the east and Darbhanga and Madhubani to the west, carrying an unusually heavy silt load. Purnia is named a high-risk district in Kosi River Basin flood assessments alongside Darbhanga, Saharsa, and Madhepura, and the 2008 Kosi flood inundated roughly 3,700 sq km across five districts including Purnia, hitting 412 panchayats and 993 villages. A single district-wide forecast cannot show which side of Purnia the river is rising toward first.
RainViewer draws its Purnia feed from the India Meteorological Department (IMD), refreshed every 5 minutes, so the live map reflects new radar scans as they arrive rather than a forecast written hours earlier. Purnia sits close enough to Katihar and Kishanganj that monsoon cells crossing this stretch of the Gangetic plain show up on the same sweep before they reach the Gulabbagh mandi or the district's maize belt. What the live map reveals and a forecast cannot: whether a building cell is tracking toward the Kosi's Purnia bank or drifting west instead.
Rain by Season in Purnia
Wet season and monsoon (June–September)
Rain builds through June and peaks in July at around 383mm, driving 82% of the district's annual total and coinciding with the Kosi River's flood season.
Kosi flood peak (August–September)
The Kosi River's flood risk is historically most severe in this window, as seen in the 2008 Kosi flood, when heavy silt and the river's shifting channel push water fastest into Purnia's low-lying farmland.
Cold and hot seasons (November–June)
Winter runs November to February with lows near 5–10°C, followed by a hot season through June that pushes temperatures to 30–45°C ahead of monsoon onset — the sharpest thermal swing of Purnia's year.
Why You Need a Rain Radar in Purnia
Maize traders at the Gulabbagh mandi
Gulabbagh hosts Asia's largest maize trading mandi, setting India's domestic maize price benchmark, with produce moving in and out daily regardless of season. A trader checking the radar before a truck run can tell whether a Kosi-season cell will delay loading or pass through quickly.
Makhana and paddy farmers
Purnia produces roughly 85% of India's makhana (fox nut) alongside maize, jute, paddy, and wheat, with 80% of the district's population tied to agriculture. Watching the live radar during the June–September wet season lets a farmer time harvest and drying around the next 20–30 minutes of rain instead of losing a crop to a sudden downpour.
Eastern India Biofuels plant workers, Ganeshpur
Bihar's first grain-based ethanol plant, near Parora, runs on local maize feedstock and depends on steady road delivery of grain through the monsoon months. A shift lead can use the radar to decide whether an incoming cell will hold up a delivery run on flood-prone stretches near the plant.
Residents near the Kosi River floodplain
The Kosi is Bihar's most flood-prone river, and roughly 76% of North Bihar's population lives under persistent flood threat from its shifting course. Tracking the river's monsoon-season cells on live radar gives floodplain residents more warning than a district bulletin.
Commuters on the Khagaria–Purnia and Patna–Purnia routes
The under-construction Khagaria–Purnia four-lane highway and the Patna–Purnia Expressway carry growing traffic through a district where monsoon rain regularly slows road travel. Checking the radar before a trip on NH 27, NH 231, or NH 131A shows whether a cell is settling in over the route.
RainViewer Radar Coverage in Purnia
RainViewer draws radar data for India from the India Meteorological Department (IMD) via mausam.imd.gov.in, updated every 5 minutes. Coverage is strongest across the Gangetic Plain, western coast, and major cities; sparser in the Himalayan foothills and remote northeast. Purnia sits within the dense Gangetic Plain coverage zone alongside Katihar and Kishanganj, so monsoon cells crossing this stretch of Bihar are visible well before they reach the district.
Purnia Rain Radar: Frequently Asked Questions
- Is it raining in Purnia right now?
The fastest way to know is a live hyperlocal radar, since monsoon cells in this part of Bihar can turn a dry morning wet within minutes and rain often falls on one side of Purnia while the Gulabbagh mandi stays dry. RainViewer pulls fresh India Meteorological Department (IMD) radar scans every 5 minutes, so the map reflects what is happening right now.
- Should I plan a visit to the Gulabbagh mandi during monsoon season?
Gulabbagh trades year-round, but June–September brings Purnia's heaviest rain and the highest chance of a delayed or muddy visit, especially in July when the district averages around 383mm. Checking the live radar before setting out shows whether a cell is passing through or settling in for the day.
- Does rain affect travel on the Khagaria–Purnia route?
Heavy monsoon rain on NH 27, NH 231, and the under-construction Khagaria–Purnia highway can slow travel, particularly as the Kosi River rises in August and September. Checking the radar before a trip shows whether a cell is likely to clear before you reach the district.
- Does Purnia flood when it rains?
Purnia is named a high-risk district in Kosi River Basin flood assessments, and the river's shifting, silt-heavy course has caused major floods, including the 2008 Kosi flood that hit 993 villages across five districts. Residents near the floodplain should track the radar closely once the river starts rising in August.
- When is the best time to visit Purnia to avoid heavy rain?
The cold season from November to February is Purnia's driest and most predictable stretch, well ahead of the June–September monsoon and the Kosi River's August–September flood peak. Visitors to the Gulabbagh mandi or the district's farmland should avoid July, the wettest month at roughly 383mm.
- Why does rain risk vary so much across Purnia during monsoon season?
The Kosi River shifts its own channel between Purnia to the east and Darbhanga and Madhubani to the west because of its heavy silt load, so flood risk within the district is uneven even when regional rainfall totals look similar. A single district-wide forecast cannot separate ordinary monsoon showers from a Kosi-driven rise, which is why a live radar showing exactly where a cell is sitting matters more here than in most Bihar districts.
- Is there a live rain radar for Purnia?
Yes — RainViewer's hyperlocal radar for Purnia draws directly from the India Meteorological Department (IMD), refreshing every 5 minutes with new scans instead of a periodic forecast update. The map covers the wider corridor from Purnia through Katihar and Kishanganj, so an approaching monsoon cell is visible before it reaches the mandi or the maize belt.
- Can I get a warning before rain hits the Gulabbagh mandi?
Yes — RainViewer's rain alerts can be set for a specific point like the Gulabbagh mandi or a farm near the Kosi floodplain, so traders and farmers get a notification as a cell approaches instead of checking the map manually. That advance window is what lets a trader decide whether to move maize under cover before the rain arrives.
Track Rain in Purnia in Real Time
Purnia's Gulabbagh maize traders and the district's makhana and paddy farmers both depend on knowing exactly where the next monsoon cell is sitting, especially once the Kosi River starts rising in August. A routine July shower here can turn into a river-driven flood risk within days.
A generic forecast says scattered showers for Purnia this week. RainViewer's live hyperlocal radar shows it is already raining over the Kosi floodplain while the Gulabbagh mandi stays dry — that is the call a maize trader makes every time a monsoon cell builds.
Track rain in Purnia — free Upgrade to Essential for alerts, forecasts, and full radar history
2-hour forecast in 5-minute slices
See whether a cell building over the district stays light or intensifies over the Kosi floodplain in the next two hours.
Rain alerts before arrival
Set an alert for the Gulabbagh mandi and get notified before a system reaches it.
Direction arrows on the map
See whether a cell is tracking toward the Kosi's Purnia bank or drifting west toward Darbhanga.
48 hours of radar history
Review the last 48 hours to see how fast an August system built before the river started rising.
Multiple locations
Track the Gulabbagh mandi, the Ganeshpur ethanol plant, and farmland near the Kosi at the same time.
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