Is it raining now in Chennai?
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Last update: 04:30, 25 Aug 2026
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Rain in Chennai: What You Need to Know
Chennai weather runs backwards compared to most of India: nearly half the city's annual rain — 443 mm of it — falls in just three months, October through December, driven by the northeast monsoon rather than the summer monsoon that soaks the rest of the country. A hyperlocal radar is the only way to track these late-year bursts as they form over the Bay of Bengal and cross the Coromandel coast.
Three rivers — the Adyar, the Cooum, and the Kosasthalaiyar — cross a flat, low-lying coastal bowl that fills fast even after a short burst. In December 2015, 348 mm of rain fell in 24 hours, exceeding the city's estimated 1-in-100-year rainfall total and triggering floods that killed more than 400 people. That kind of rapid inundation happens on a timescale a daily forecast can't track — only a live radar following the storm cell over the city catches it in time.
RainViewer's Chennai weather map pulls from India Meteorological Department radar, refreshed every 5 minutes, tracking cells as they move off the Bay of Bengal toward the Adyar and Cooum basins. The live map shows what a forecast can't: whether a cell forming over the coast is heading for OMR or staying offshore.
Rain by Season in Chennai
Northeast monsoon (October–December)
Chennai's defining rainy season runs October through December, delivering 48% of the year's total rainfall — the reverse of most Indian cities, where the June–September monsoon dominates. Cyclone season overlaps this window: Cyclone Michaung in December 2023 submerged the Chennai airport runway and halted flights, and Cyclone Fengal followed in November 2024. This is the most operationally disruptive stretch for anyone flying through MAA or commuting the OMR IT corridor.
Transition months (June–September)
The southwest monsoon technically runs June through September, but its strength in Chennai is typically inverse to the northeast monsoon — when one is strong, the other tends to be weak, making this stretch genuinely unpredictable. Outdoor plans and construction schedules along the Adyar basin are hardest to plan around during these months because rainfall totals swing widely year to year.
Dry season (January–May)
January through May is Chennai's dry stretch, with March the driest month at just 3.4 mm on average. Locals resume normal outdoor routines along Marina Beach and the Adyar riverside, and the city's flood-prone low-lying wards see their only real reprieve of the year.
Why You Need a Rain Radar in Chennai
IT commuters on OMR
IT professionals commuting the OMR corridor through Sholinganallur — home to Cognizant, Infosys, and dozens of other multinationals — check the radar before leaving Taramani or Sholinganallur, since northeast monsoon bursts turn OMR's peak-hour traffic into a standstill within minutes.
Air travelers at Chennai Airport
Anyone flying through Chennai International Airport (MAA) during October–December checks the radar before heading to the terminal — Cyclone Michaung submerged the runway in December 2023, and even a lesser burst near the Adyar basin can trigger delays.
Residents near the Adyar and Cooum basins
Residents along the Adyar and Cooum river basins, the city's primary riverine flood risk, track the radar during heavy northeast monsoon spells to see whether a cell is building before water starts rising — Chennai's CFLOWS flood-warning system was built after the 2015 disaster for exactly this kind of lead time.
Auto sector shift workers
Workers at the Hyundai and Ford plants that anchor Chennai's "Detroit of Asia" auto corridor check the radar before a shift change, since heavy bursts along the GST Road (NH 32) route to the plants can back up traffic fast.
Visitors to Marina Beach and the Mahabalipuram coast
Visitors planning a walk along Marina Beach or a day trip down the Mahabalipuram coast check the radar first — northeast monsoon cells move in off the Bay of Bengal quickly, and a clear morning can turn wet with little notice.
RainViewer Radar Coverage in Chennai
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. From Chennai, the same coverage extends north to Andhra Pradesh's coast and south toward Puducherry and the Coromandel coastline.
Chennai Rain Radar: Frequently Asked Questions
- Is it raining in Chennai right now?
The only reliable answer is a live radar check — Chennai's northeast monsoon cells move in fast off the Bay of Bengal and can hit the Adyar basin while OMR stays dry. RainViewer's hyperlocal radar draws on India Meteorological Department data and updates every 5 minutes, showing exactly where rain is falling right now.
- Should I commute OMR today?
Check the radar before leaving Taramani or Sholinganallur — a northeast monsoon burst can turn OMR's peak-hour traffic into a standstill within minutes. RainViewer shows whether a cell is moving toward the corridor 20 to 30 minutes ahead, enough time to leave earlier or wait it out.
- Does rain affect flights at Chennai Airport?
Yes — Cyclone Michaung submerged the MAA runway in December 2023 and halted operations, and lesser bursts near the Adyar basin still cause delays. Checking the radar before heading to the terminal shows whether a cell is building over the airport corridor along GST Road.
- Does Chennai flood when it rains?
Yes — the Adyar and Cooum river basins are the city's primary flood risk, and December 2015 saw 348 mm fall in 24 hours, killing more than 400 people. Chennai's CFLOWS flood-warning system was built after that disaster, and checking the radar adds the minute-by-minute layer it doesn't cover alone.
- When is the best time to visit Chennai to avoid rain?
January through May is Chennai's dry season, with March the lowest-rainfall month at just 3.4 mm. Outdoor plans along Marina Beach or a Mahabalipuram day trip face the least disruption in this window, well outside the October–December northeast monsoon.
- Why does Chennai's rain come at a different time than the rest of India?
Chennai gets 48% of its annual rainfall from the northeast monsoon in October–December, not the June–September southwest monsoon that soaks most of the country — and the two seasons are typically inverse in strength here. That reversal is why a generic India monsoon forecast misses Chennai weather, and why live radar tracking Bay of Bengal cells matters more here than a calendar-based outlook.
- Is there a live rain radar for Chennai?
Yes — RainViewer's hyperlocal radar for Chennai draws on India Meteorological Department (IMD) data, refreshed every 5 minutes. It tracks cells moving off the Bay of Bengal toward the Adyar and Cooum basins rather than giving one city-wide reading.
- Can I get a warning before rain hits Chennai?
Yes — RainViewer's rain alert can be set for a specific spot, like the OMR corridor near Sholinganallur or the MAA airport approach, and it triggers before the rain arrives. That gives commuters and travelers time to adjust before a northeast monsoon burst hits.
Track Rain in Chennai in Real Time
Commuting OMR through Sholinganallur or flying out of MAA during the northeast monsoon — Chennai's October–December rain arrives fast and floods low-lying basins faster.
A cell can move off the Bay of Bengal and reach the Adyar basin within the half hour, well before a standard forecast catches up.
Your weather app said light rain for Chennai this evening. RainViewer shows a cell already sitting over the Adyar basin and OMR still clear — that's the call an IT commuter in Sholinganallur makes every time the northeast monsoon builds.
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2-hour forecast in 5-minute slices
see exactly when an OMR-bound cell clears so a commute doesn't turn into a standstill.
Rain alerts before arrival
set an alert for the MAA airport approach or the OMR corridor near Taramani so a trip to the terminal or office doesn't start in a downpour.
Direction arrows on the map
Chennai's northeast monsoon cells typically arrive off the Bay of Bengal from the east; direction arrows show a storm's approach before it crosses the coast.
48 hours of radar history
check how a system has tracked over the Adyar basin during a multi-day northeast monsoon spell.
Multiple locations
track OMR near Sholinganallur, the MAA airport, and Marina Beach at the same time.
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