Is it raining now in Arrah?
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15 AugNo upcoming precipitation for the next hour.
Last update: 21:30, 15 Aug 2026
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Rain in Arrah: What You Need to Know
Arrah weather is sharply seasonal — July is the wettest month at around 329mm and November the driest at just 6mm, out of roughly 1,155mm of annual rain concentrated in the SW monsoon. A live rain radar for Arrah earns its keep because the city sits near the Ganga-Sone confluence, about 39km from Danapur, where simultaneous spate on both rivers can amplify flood risk beyond what single-river towns face. In 2016, a release of 11.67 lakh cusecs from the Indrapuri barrage into the Sone triggered Bihar's worst flood since 1975, killing 9 people in Bhojpur district.
The mechanism is upstream releases decoupling flood timing from local rain. Monsoon reaches Bihar around mid-to-late June and withdraws around mid-October, but a barrage release far upstream on the Sone can send a flood surge into Arrah's district on a day with no local rain at all. A city-wide forecast cannot show that the Sone is rising from a barrage decision made hours earlier, which is why Bhojpur district is repeatedly named among Bihar's districts under imminent flood threat when the Ganga, Sone, Gandak and Kosi swell together.
RainViewer draws its Arrah feed from the India Meteorological Department (IMD), refreshed every 5 minutes, so the hyperlocal radar reflects new scans as they arrive rather than a forecast written hours earlier. Arrah sits close enough to Danapur and the wider Ganga-Sone corridor that storm bands feeding both rivers show up on the same sweep before levels rise at the confluence. What the live map reveals and a forecast cannot: whether a cell over the district is adding to an already-rising Sone or falling well clear of it.
Rain by Season in Arrah
SW monsoon (June–September)
The monsoon delivers Arrah's heaviest rain, peaking in July at around 329mm. This is the district's highest-risk window for Ganga and Sone flooding, especially when upstream barrage releases coincide with local downpours.
Post-monsoon transition (October–early November)
Monsoon withdrawal timing varies, and upstream barrage releases can still decouple flood timing from local rain even as the season winds down. Chhath Puja, held in this window, draws large crowds to Ganga ghats across Bhojpur district while river levels remain elevated from the season.
Dry season (November–May)
November is the driest month at just 6mm, with pre-monsoon heat building through April and May. River levels and flood risk drop to their lowest point of the year during this stretch.
Why You Need a Rain Radar in Arrah
Rice and grain traders at Arrah APMC mandi
The mandi is Bhojpur district's major rice and paddy trading hub, with wholesale rice trading around ₹9,300/quintal. A trader checking the radar can time grain movement around a Ganga-Sone flood risk rather than local rain alone.
Rail passengers through Ara Junction
Ara Junction sits on the Howrah-Patna-Delhi main line with 150+ trains passing daily, and monsoon flooding disrupts this corridor. Checking the radar before a journey shows whether a cell near the confluence is likely to cause delays.
Freight drivers on NH-922 and NH-319
NH-922 (Patna-Arrah-Buxar) and NH-319 (Arrah-Mohania) are the city's primary highways, exposed to monsoon flooding near the Ganga-Sone confluence. Checking the radar before a run shows whether a route is likely to flood.
Pilgrims at Chhath Puja on Bhojpur's Ganga ghats
Chhath Puja draws large crowds to riverbank ghats in the October/November post-monsoon window, timed after peak flood risk but while river levels remain elevated. Checking the radar before the multi-day ritual shows whether conditions near the ghats are safe.
Residents near the Ganga-Sone confluence
Bhojpur district is repeatedly named among Bihar's ten districts under imminent flood threat when the Ganga, Sone, Gandak and Kosi swell together. Residents watching the radar during a monsoon cell get earlier warning than the Bihar Water Resources Department's real-time flood alert system alone provides.
RainViewer Radar Coverage in Arrah
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. Arrah sits well within the strong Gangetic Plain coverage zone alongside Danapur and Patna, so storm bands feeding the Ganga-Sone confluence are visible before levels rise near the city.
Arrah Rain Radar: Frequently Asked Questions
- Is it raining in Arrah right now?
The fastest way to know is a live hyperlocal radar, since Gangetic-plain convection can turn a dry morning wet within minutes near the Ganga-Sone confluence. RainViewer pulls fresh India Meteorological Department (IMD) scans every 5 minutes, so the map reflects what is happening right now rather than a forecast written hours earlier.
- Should I plan Chhath Puja travel to Arrah during monsoon season?
Chhath Puja falls in the October/November post-monsoon window, after the SW monsoon's June–September peak but while river levels near Bhojpur's ghats can still be elevated. Checking the radar before the ritual is worth it given the crowd size at riverside ghats.
- Does rain affect freight movement on NH-922 near Arrah?
Heavy monsoon rain and Ganga-Sone confluence flooding can disrupt NH-922 (Patna-Arrah-Buxar) and NH-319 (Arrah-Mohania). Checking the radar before a run on either highway shows whether a cell is passing through or a confluence flood risk is building.
- Does Arrah flood when it rains?
Yes — Bhojpur district is repeatedly named among Bihar's ten districts under imminent flood threat when the Ganga, Sone, Gandak and Kosi rivers swell together, and a 2016 release of 11.67 lakh cusecs from the Indrapuri barrage into the Sone caused Bihar's worst flood since 1975, killing 9 in the district. Flooding here often follows upstream barrage decisions as much as local rain.
- When is the best time to visit Arrah to avoid heavy rain?
November through May is Arrah's dry stretch, with November the driest month at just 6mm, well clear of the July peak at around 329mm. Visitors planning travel near the Ganga-Sone confluence should avoid the June–September monsoon window, when barrage-driven flood risk is highest.
- Why can Arrah flood without a local downpour?
Arrah sits near the Ganga-Sone confluence, about 39km from Danapur, where upstream barrage releases — like the 2016 Indrapuri barrage release of 11.67 lakh cusecs — can send a flood surge downstream regardless of local rainfall that day. A local forecast cannot show that the Sone is rising from a decision made hours earlier upstream, which is why radar-based monitoring of the wider basin matters here.
- Is there a live rain radar for Arrah?
Yes — RainViewer's hyperlocal radar for Arrah 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 Ganga-Sone corridor from Arrah through Danapur and Patna.
- Can I get a warning before rain hits Arrah's rice mandi?
Yes — RainViewer's rain alerts can be set for a specific point like the APMC mandi or Ara Junction, so traders and commuters get a notification as a cell approaches instead of checking the map manually. That advance window is what lets a mandi trader decide whether to move grain before the rain arrives.
Track Rain in Arrah in Real Time
Rice traders at Arrah's APMC mandi and commuters at Ara Junction both depend on knowing whether a cell near the Ganga-Sone confluence is building. A barrage release upstream can raise river levels even on a dry day, and the district's 2016 flood showed how fast that risk compounds with local rain.
A generic forecast says scattered showers for Arrah this week. RainViewer's live hyperlocal radar shows it is already raining over the Ganga-Sone confluence while the APMC mandi stays dry — that is the call a trader makes every time a monsoon cell builds.
Track rain in Arrah — free Upgrade to Essential for alerts, forecasts, and full radar history
2-hour forecast in 5-minute slices
See whether a cell over Bhojpur district stays light or intensifies toward the confluence in the next two hours.
Rain alerts before arrival
Set an alert for the APMC mandi and get notified before a system reaches it.
Direction arrows on the map
See whether a cell is tracking toward the Ganga-Sone confluence or sliding past toward Danapur.
48 hours of radar history
Review the last 48 hours to see how fast a monsoon cell built before river levels rose.
Multiple locations
Track the APMC mandi, Ara Junction, and the Ganga-Sone confluence at the same time.
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