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Last update: 01:30, 25 Aug 2026
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Thanjavur weather runs backwards from most of India: the Northeast Monsoon, arriving October through December, delivers 52–55% of the district's annual rainfall, while the Southwest Monsoon that dominates most of the country contributes only 30–32% here, with November consistently the wettest month. A hyperlocal radar for Thanjavur earns its place in this reversed pattern, because the flat, low-elevation Cauvery Delta terrain amplifies swings between flood and drought years — extreme wet years like 1993, 2005 and 2015 topped 1,500mm, while drought years like 2002, 2012 and 2016 fell below 750mm.
The mechanism is delta hydrology: the Cauvery River and its Grand Anaicut Canal system, with subsidiaries including the Vennaru, Vettar, Kudamuruti, Thirumalairajan and Arasalar, are prone to overflow during the Northeast Monsoon peak. On terrain this flat, a canal overflow can spread across low-lying paddy tracts far from where the heaviest rain actually fell. A single Tamil Nadu-wide forecast cannot show whether a Northeast Monsoon burst is filling the Vennaru or the Arasalar first, which matters directly to which fields flood.
RainViewer draws its Thanjavur feed from the India Meteorological Department (IMD), refreshed every 5 minutes, so the live map reflects new radar scans rather than a forecast written hours earlier. Thanjavur sits close enough to Tiruchirapalli that storm bands crossing the Cauvery delta are visible on the same sweep before they reach the city. What the live map reveals and a forecast cannot: whether a Northeast Monsoon cell is building directly over the delta's canal network or tracking toward a different part of the district.
This is Thanjavur's dominant wet season, contributing 52–55% of annual rainfall and peaking in November. The Samba and Thaladi paddy crops, sown August through October, depend on this window for their growing-season water.
As the Southwest Monsoon withdraws and the Northeast Monsoon sets in, rainfall becomes unpredictable — a period the delta's three-crop paddy calendar has to work around.
The Southwest Monsoon contributes a secondary 30–32% of annual rain from June to September, feeding the Kuruvai crop, while February through May is Thanjavur's dry season, with 2002, 2012 and 2016 among the recorded drought years.
The Vennaru and Grand Anaicut Canal subsidiaries — Vettar, Kudamuruti, Thirumalairajan and Arasalar — carry overflow risk during the Northeast Monsoon peak. A farmer checking the radar before the November peak can see whether a canal near their fields is likely to overflow.
Thanjavur's paddy calendar runs three overlapping crops — Kuruvai (June–September), Samba (August–January) and Thaladi (September/October–February/March) — with about 70% of the district's population working in agriculture and allied activities. Checking the radar helps time planting and harvest around whichever monsoon is active.
Thanjavur's silk-weaving centre, historically around 200 units, depends on dry conditions for finishing and drying work. A unit operator checking the radar can plan outdoor drying around a Northeast Monsoon burst.
Mills processing the delta's rice, sugar and oilseed output — Thanjavur produces roughly a quarter of Tamil Nadu's total rice — depend on dry conditions for storage and outdoor handling. Checking the radar helps a mill operator time loading around a passing shower.
The nearest airport to Thanjavur is Tiruchirapalli International Airport (TRZ), about 59.6km away. Travelers checking the radar before the drive in, especially during the October–December Northeast Monsoon peak when canal overflow can affect road conditions, can plan around an active spell.
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. Thanjavur sits within reach of Tiruchirapalli on the same radar corridor, so Northeast Monsoon bands crossing the Cauvery delta are visible before they reach the district's canal network.
The fastest way to know is a live hyperlocal radar, since flat delta terrain means a Northeast Monsoon cell can flood one canal-fed tract while a neighboring field stays dry. RainViewer pulls fresh India Meteorological Department (IMD) radar scans every 5 minutes, so the map reflects what is happening now rather than a forecast written hours earlier.
Thanjavur runs three overlapping paddy crops — Kuruvai, Samba and Thaladi — each timed to a different part of the Southwest or Northeast Monsoon. Checking the radar before planting or harvest work is more reliable than a general seasonal forecast, especially during the unpredictable September–October transition.
Heavy Northeast Monsoon rain between October and December can affect road conditions on the roughly 59.6km route from Tiruchirapalli International Airport (TRZ) into Thanjavur, since canal overflow from the Grand Anaicut system can spread across low-lying tracts. Checking the radar before the drive shows whether a cell is passing through or settling in.
Yes — the Cauvery River and its Grand Anaicut Canal system, including the Vennaru, Vettar, Kudamuruti, Thirumalairajan and Arasalar subsidiaries, are prone to overflow during the Northeast Monsoon peak, affecting low-lying agricultural tracts district-wide. Extreme wet years like 1993, 2005 and 2015 exceeded 1,500mm of rainfall.
February through May is Thanjavur's dry season, well clear of the Northeast Monsoon peak. Visitors should avoid October through December, when November is consistently the wettest month and canal overflow risk is highest.
Unlike most of India, Thanjavur gets the bulk of its rain — 52–55% of the annual total — from the Northeast Monsoon between October and December, rather than the Southwest Monsoon that dominates elsewhere and contributes only 30–32% here. That reversal, combined with the flat Cauvery Delta's tendency to swing between extreme wet years (1993, 2005, 2015) and drought years (2002, 2012, 2016), is why a single seasonal forecast is less useful here than live radar tracking of an individual Northeast Monsoon cell.
Yes — RainViewer's hyperlocal radar for Thanjavur draws directly from the India Meteorological Department (IMD), refreshing every 5 minutes with new scans instead of a periodic forecast update. The map covers Thanjavur alongside Tiruchirapalli on the same radar corridor.
Yes — RainViewer's rain alerts can be set for a specific point such as a paddy tract near the Vennaru or Arasalar canal, or a silk-weaving unit, so farmers and operators get a notification as a cell approaches instead of checking the map manually. That advance window matters most during the October–December Northeast Monsoon peak.
Cauvery delta farmers running the Kuruvai, Samba and Thaladi paddy calendar and Thanjavur's silk-weaving units both depend on knowing whether a Northeast Monsoon cell is about to overflow the Vennaru or Arasalar canal system. Thanjavur's flat delta terrain means that overflow can spread far from where the heaviest rain actually fell.
A generic forecast says scattered showers for the Cauvery delta this week. RainViewer's live hyperlocal radar shows the Vennaru canal already rising while a paddy tract a few kilometres away stays dry — that is the call a delta farmer makes every time a Northeast Monsoon cell builds.
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See whether a cell building over the delta stays contained or pushes the Grand Anaicut canal system toward overflow in the next two hours.
Set an alert for a paddy tract or a silk-weaving unit and get notified before a system reaches it.
See whether a Northeast Monsoon storm is tracking in toward Thanjavur or sliding past toward Tiruchirapalli.
Review the last 48 hours to see how a November monsoon spell built before it reached the delta.
Track a paddy field, a silk-weaving unit, and the Tiruchirapalli Airport route at the same time.