Is it raining now in Sitamarhi?
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Last update: 04:30, 25 Aug 2026
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Rain in Sitamarhi: What You Need to Know
Sitamarhi weather depends on rain that does not even need to fall locally: southwest monsoon rainfall in Nepal's catchment areas directly drives Bagmati River discharge into Sitamarhi, an amplifier unique to this border district. A hyperlocal radar for Sitamarhi matters because a local sky can be clear while a Nepal barrage release is already pushing the Bagmati toward flood stage — the kind of gap a district-only forecast cannot show.
The mechanism is cross-border discharge meeting flat Gangetic-plain topography. Record water releases from Nepal barrages compound local monsoon rain, and once the Bagmati overtops its embankments, the flat terrain lets floodwater persist for weeks to months rather than draining away. That is not a hypothetical: on September 28, one release event alone sent 661,000 cusecs from the Birpur Barrage on the Kosi and 562,000 cusecs from the Valmikinagar Barrage on the Gandak into north Bihar's river systems, and the Bagmati embankment at Belsand block, Sitamarhi breached the next day, displacing around 2,000 families. A regional forecast built for "Bihar" cannot show that Sitamarhi's flood risk is tied as much to Nepal's rainfall as to its own.
RainViewer draws its Sitamarhi 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. The Bagmati corridor through Belsand block and Sitamarhi's paddy floodplain both sit on the same sweep, so a build-up over the district shows up alongside whatever the river is already carrying downstream. What the live map reveals and a forecast cannot: whether local rain is adding to an already-rising Bagmati or falling on ground the river has not yet reached.
Rain by Season in Sitamarhi
Kharif monsoon season (June–September)
Paddy cultivation on the Bagmati floodplain runs on this window, dependent on both local rainfall and the river's monsoon-driven discharge from Nepal's catchment. This is the season when the district's flood exposure is most active.
Peak flood risk (late September)
Late September is Sitamarhi's most dangerous stretch, the window that produced the September 2024 Bagmati embankment breach at Belsand block after record barrage releases from Nepal. Cross-border releases from the Valmikinagar and Birpur barrages on the Gandak and Kosi systems are a named seasonal trigger for this period.
Rabi season (November–February)
The winter cropping season follows once floodwater recedes and embankments are assessed or repaired. This stretch depends on how much of the Kharif floodplain remains usable after the monsoon's peak flood risk has passed.
Why You Need a Rain Radar in Sitamarhi
Paddy farmers on the Bagmati floodplain
Paddy cultivation is Sitamarhi's dominant economic activity, grown directly on land the Bagmati has flooded before, including standing crops destroyed in the 2024 breach. Farmers checking the radar during the Kharif season can judge whether local rain is adding to river levels already elevated by upstream releases.
Belsand block residents near the embankment
The Bagmati embankment breach at Belsand block on September 29 displaced around 2,000 families and forced evacuations from villages including Madhkaul, Olipur, Zafarpur, and Madar. Residents watching the radar during late September, the district's peak flood-risk window, get warning before local rain compounds an already-rising river.
Households in Bagmati floodplain villages
With over 50,000 people affected by the 2024 breach and standing crops and brick houses damaged, floodplain households have direct reason to track rain closely. Checking the radar alongside barrage-release news gives residents a fuller picture than either source alone.
RainViewer Radar Coverage in Sitamarhi
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. Sitamarhi sits within the strong Gangetic Plain coverage zone near the Nepal border, so monsoon cells crossing the district and the Bagmati corridor are visible on the same sweep as the wider north Bihar flood belt.
Sitamarhi Rain Radar: Frequently Asked Questions
- Is it raining in Sitamarhi right now?
The fastest way to know is a live hyperlocal radar, since Sitamarhi's flood risk depends on both local rain and Nepal barrage releases that can raise the Bagmati even on a dry local day. RainViewer pulls fresh India Meteorological Department (IMD) radar scans every 5 minutes, so the map reflects what is happening right now.
- Can I plan paddy field work around the monsoon in Sitamarhi?
Field work on the Bagmati floodplain is safest planned around both local rain cells and river levels, since the two do not always rise together. Checking the radar before entering low-lying fields during the Kharif season reduces exposure to a sudden river rise.
- Is travel through Belsand block affected by monsoon rain?
Yes — the Bagmati embankment at Belsand block breached in September 2024, displacing around 2,000 families and cutting off villages including Madhkaul and Olipur. Checking the radar before travel through the block during late September, the district's peak flood-risk window, is worth the time it takes.
- Does Sitamarhi flood when it rains heavily?
Yes — the Bagmati embankment at Belsand block breached on September 29, 2024, after record Nepal barrage releases, displacing roughly 2,000 families and affecting over 50,000 people across villages including Madhkaul, Olipur, Zafarpur, and Madar. Standing paddy crops and brick houses were destroyed in that event.
- When is the best time to visit or travel through Sitamarhi to avoid heavy rain?
The Rabi season from November to February is Sitamarhi's most predictable stretch, well after the late-September peak flood-risk window tied to the Bagmati. Travel through Belsand block and the floodplain is riskiest in late September, when Nepal barrage releases have compounded local monsoon rain before.
- Why does Sitamarhi flood even when local rain seems light?
Southwest monsoon rainfall in Nepal's catchment areas drives Bagmati River discharge into Sitamarhi directly, so a barrage release like the 661,000 cusecs from Birpur and 562,000 cusecs from Valmikinagar recorded on September 28 can raise the river regardless of what falls locally. That cross-border amplifier is unique to this border district and is why the Belsand embankment breached the very next day.
- Is there a live rain radar for Sitamarhi?
Yes — RainViewer's hyperlocal radar for Sitamarhi 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 Bagmati corridor through Belsand block on the same sweep as the surrounding floodplain.
- Can I get a rain alert before flooding reaches Belsand block?
Yes — RainViewer's rain alerts can be set for a specific point like Belsand block along the Bagmati, so residents get a notification as a cell approaches instead of checking the map manually. That advance window matters most in late September, the district's documented peak flood-risk period.
Track Rain in Sitamarhi in Real Time
Sitamarhi's paddy farmers work a floodplain shaped as much by Nepal's rainfall as by local weather, and Belsand block residents have already lived through one embankment breach that displaced 2,000 families. Late September is when local rain and upstream barrage releases are most likely to arrive together.
A generic Bihar monsoon forecast says heavy rain for north Bihar this week. RainViewer's live hyperlocal radar shows it is already raining hard over Belsand block while other parts of the floodplain stay dry — that is the call a farmer or resident makes every time a late-September cell builds.
Track rain in Sitamarhi — free Upgrade to Essential for alerts, forecasts, and full radar history
2-hour forecast in 5-minute slices
See whether a cell over Sitamarhi is building toward the Bagmati in the next two hours.
Rain alerts before arrival
Set an alert for Belsand block and get notified before a cell reaches the embankment.
Direction arrows on the map
See whether a cell is tracking toward the Bagmati corridor or moving off across the wider floodplain.
48 hours of radar history
Review the last 48 hours to see how a late-September system built before the 2024-style breach.
Multiple locations
Track Belsand block, the Bagmati corridor, and Sitamarhi's paddy floodplain at the same time.
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