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Last update: 04:30, 25 Aug 2026
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Rain in Nellore: What You Need to Know
Nellore weather runs backwards from most of India — the Northeast monsoon, not the Southwest one, supplies around 60% of the city's annual rainfall between October and December. November is the wettest month, with more than 230mm typically falling, and Bay of Bengal cyclones like Ditwah in November 2025 have swelled the Penna River enough to trigger district high alerts. A hyperlocal radar that updates every five minutes is the only way to see one of these cyclone-linked cells intensifying before the river rises.
Nellore's position roughly 24km from the Bay of Bengal moderates temperature swings but fuels convective, cyclone-linked downpours from October through December, a pattern distinct from the Southwest-monsoon-dominated rainfall most Indian cities see June through September. That's why Nellore's rainfall swings sharply year to year — the district alternates between drought and flood seasonally, depending on how active the cyclone season turns out to be.
RainViewer draws its India radar feed from the India Meteorological Department (IMD), refreshing every five minutes, so aquaculture operators and Krishnapatnam Port staff can see a cyclone-linked cell building over the Bay of Bengal before it reaches the coast. A forecast says a cyclone signal is possible; the live map shows exactly how the rain band is moving toward Nellore right now.
Rain by Season in Nellore
Northeast monsoon (October–December)
Nellore's primary wet season runs October through December, peaking in November when rainfall regularly exceeds 230mm. This is when Bay of Bengal cyclones do the most damage — Cyclone Nivar in November 2020 pushed roughly 4 lakh cusecs into the Somasila reservoir and displaced over 17,000 people into relief camps, and Cyclone Ditwah repeated the pattern in November 2025. It's the most disruptive window for both the aquaculture industry and Krishnapatnam Port operations.
Transition months (September–October)
September and October are the least predictable months in Nellore, as the Southwest monsoon's withdrawal overlaps with the Northeast monsoon's onset and active cyclogenesis in the Bay of Bengal. A forecast made even a few days out can miss a cyclone forming in this window, which is why checking radar close to travel time matters more here than in most Indian cities.
Dry season (January–May)
January through May is Nellore's dry season, with April and May the hottest months and low cyclone risk but high heat stress. There's also a lighter, secondary Southwest monsoon wet spell from June through September, feeding kharif paddy sowing ahead of the main Northeast-monsoon-driven Rabi season.
Why You Need a Rain Radar in Nellore
Aquaculture and shrimp processing operators
Nellore is known as the "Shrimp Capital of India," with roughly 13,407 hectares of aquazonation exposed to storm surge during cyclone season. Checking radar before a cyclone-linked cell arrives gives operators time to secure ponds and processing equipment.
Krishnapatnam Port workers
The port has hoisted cyclone warning signals multiple times, including Signal 1 in November 2021 and Signal 3 in October 2024, halting operations each time. Checking radar shows how close an approaching system is before a signal is raised.
Somasila and Kandaleru reservoir-dependent farmers
These Penna River reservoirs irrigate 300,000 acres across Nellore and Tirupati, with Rabi paddy — 80% of the 2023–24 sown area — depending on Northeast-monsoon-fed releases. Farmers checking radar during the wet season can anticipate reservoir release timing.
Coastal mandal residents (Muttukuru, Tada, Sullurpeta, Vakadu)
These coastal mandals recorded the district's heaviest 24-hour rainfall totals in November 2021, between 18–19cm each. Watching radar for an approaching cyclone-linked band gives earlier warning than waiting for a district alert.
NH16 and rail travelers
NH16, part of the Golden Quadrilateral connecting Kolkata to Chennai, and the Vijayawada-Gudur rail section both face monsoon disruption. A traveler can check radar before a Nellore Railway Station (NLR) connection to see if a system is currently active near the coast.
RainViewer Radar Coverage in Nellore
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. Nellore's feed also covers neighboring Tirupati and the wider Andhra Pradesh coastal corridor along the Bay of Bengal.
Nellore Rain Radar: Frequently Asked Questions
- Is it raining in Nellore right now?
The only reliable way to know is a live radar check — Nellore's Northeast-monsoon pattern means rain can arrive suddenly with cyclone activity in the Bay of Bengal, unlike the steadier Southwest-monsoon rain most of India sees. RainViewer's hyperlocal radar draws on India Meteorological Department (IMD) data updated every 5 minutes, showing precipitation building along the coast in real time.
- Should I plan aquaculture work in Nellore during cyclone season?
Check the radar before scheduling pond work — November is Nellore's wettest month and the peak of Bay of Bengal cyclone activity, with Cyclone Ditwah swelling the Penna River as recently as 2025. A live radar check shows whether a cyclone-linked cell is currently approaching the coast.
- Does rain affect Krishnapatnam Port operations?
Yes — the port has hoisted cyclone warning signals and halted operations multiple times, including Signal 1 in November 2021 and Signal 3 in October 2024. Checking radar before a shift shows how close an approaching system currently is.
- Does Nellore flood when it rains heavily?
Yes — the Penna River has flooded after cyclone-driven rain pushed heavy inflow into the Somasila reservoir, most severely during Cyclone Nivar in 2020 when roughly 4 lakh cusecs displaced over 17,000 people into relief camps. ThinkHazard rates Nellore's river flood hazard "medium," with over a 20% chance in any 10-year period.
- When is the best time to visit Nellore to avoid rain disruption?
January through May is Nellore's dry season with low cyclone risk, though April and May bring high heat instead. October through December carries the highest rainfall and cyclone risk, driven by the Northeast monsoon.
- Why does Nellore's rain pattern run opposite to most of India?
Most Indian cities get the bulk of their rain from the Southwest monsoon, June through September, but Nellore's coastal position on the Bay of Bengal means the Northeast monsoon, October through December, supplies around 60% of its annual total instead. That reversal is why Nellore's heaviest rain and worst flooding come from Bay of Bengal cyclones rather than the standard monsoon season most forecasts are tuned to.
- Is there a live rain radar for Nellore?
Yes — RainViewer's hyperlocal radar for Nellore draws on India Meteorological Department (IMD) data, refreshed every 5 minutes. It shows cyclone-linked rain bands building over the Bay of Bengal before they reach the coast.
- Can I get a warning before rain hits Nellore?
Yes — RainViewer's rain alerts can be set for a specific point, such as Krishnapatnam Port or an aquaculture zone, and notify you before precipitation arrives there. That gives operators time to secure equipment before a cyclone-linked cell makes landfall.
Track Rain in Nellore in Real Time
Krishnapatnam Port staff use live radar to track a cyclone-linked cell over the Bay of Bengal, not a weekly forecast.
Rain here runs on the Northeast monsoon, arriving suddenly with cyclone activity rather than the steady Southwest-monsoon pattern most of India follows.
Your weather app said a cyclone signal is possible for Nellore. RainViewer shows the rain band already 40km off the coast and closing on Krishnapatnam Port — that's the call a port operator makes before halting cargo operations.
Track rain in Nellore — free Upgrade to Essential for alerts, forecasts, and full radar history
2-hour forecast in 5-minute slices
See a Bay of Bengal rain band's exact path before it reaches Krishnapatnam Port.
Rain alerts before arrival
Set an alert for an aquaculture zone and get notified before the next cyclone-linked cell arrives.
Direction arrows on the map
Nellore's heaviest cells arrive off the Bay of Bengal to the east — the map shows exactly where they're headed.
48 hours of radar history
Check whether the rain that swelled the Penna River has fully cleared.
Multiple locations
Track Krishnapatnam Port, the Somasila reservoir, and coastal Muttukuru at the same time.
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