Is it raining now in Thiruvananthapuram?
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25 AugNo upcoming precipitation for the next hour.
Last update: 04:30, 25 Aug 2026
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Rain in Thiruvananthapuram: What You Need to Know
Thiruvananthapuram weather runs on two separate monsoon systems in the same year — the southwest monsoon typically reaches Kerala here first, by around 1 June, then a second wet burst arrives with the northeast monsoon around 20 October. A hyperlocal radar is what actually shows a Vanchiyoor resident whether today's rain belongs to a passing shower or a system building toward flood stage, not a single seasonal average across the city's roughly 2,099 mm of annual rain.
The Karamana and Killi rivers drive urban riverine flooding directly through Thiruvananthapuram, with wards like Kattayikonam, Sreekaryam, Medical College, Shangumukham, Vanchiyoor and Kadakampalli named among the city's highly flood-prone areas. Kerala flood studies from 2018 and 2019 found that the most extreme rainfall events here correlate strongly with mid- and upper-tropospheric convection — the kind of fast-building vertical storm structure a standard surface forecast is poorly equipped to catch.
RainViewer pulls its India Meteorological Department (IMD) radar feed into a live map updated every 5 minutes, tracking cells across Thiruvananthapuram and the Karamana-Killi river network feeding it. What a single monsoon-season average can't show is whether the convective cell building over Sreekaryam right now is headed for Vanchiyoor next — the live map does.
Rain by Season in Thiruvananthapuram
Southwest Monsoon (June–September)
Thiruvananthapuram's southwest monsoon typically arrives by around 1 June — Kerala's earliest landfall point for the season — and delivers about 70% of the state's annual rainfall, with June alone averaging roughly 323 mm, the wettest month of the year. This is the window when Karamana and Killi river flooding is most likely to hit Vanchiyoor, Sreekaryam and Medical College ward, and when Technopark's IT/ITES workforce faces its most disrupted commute of the year.
Northeast Monsoon (late October–December)
A second wet season arrives with the northeast monsoon, onset around 20 October and running roughly 50 days into December, adding a burst of rain most single-monsoon interior Indian cities never see. The September–October transition, when the southwest monsoon's withdrawal overlaps this second system's arrival, is Thiruvananthapuram's least predictable stretch, complicating plans for Kovalam and Shangumukham beach visitors.
Dry Season (mid-December–May)
From mid-December through May, Thiruvananthapuram runs largely dry, and Technopark commuters and Thiruvananthapuram International Airport traffic move without the flood disruption that defines the two monsoon windows. Kovalam and Shangumukham beach tourism sees its steadiest conditions of the year, though coastal erosion linked to Vizhinjam port construction remains a year-round concern.
Why You Need a Rain Radar in Thiruvananthapuram
Technopark IT/ITES commuters
Technopark anchors Thiruvananthapuram's tech sector about 13 km from the airport and is served by KSRTC buses along NH66. Commuters checking the radar before leaving can see whether a convective cell is sitting over their route before boarding a bus or driving in.
Vanchiyoor and Sreekaryam residents
Vanchiyoor, Sreekaryam, Kattayikonam, Medical College ward, Shangumukham and Kadakampalli are named among Thiruvananthapuram's most flood-prone wards, driven by the Karamana and Killi rivers overflowing during heavy monsoon rain. Checking the radar before heading into any of these wards shows whether river-linked flooding is currently active.
Thiruvananthapuram International Airport travelers
The airport handled a record 4.89 million passengers in 2024-25, and travelers timing an arrival or departure can check the radar to see whether a southwest or northeast monsoon cell is likely to affect the roughly 13 km route from Technopark or the wider city.
Vizhinjam fishing community
More than 50,000 workers around Vizhinjam depend on the fishing economy, already affected by port-driven coastal erosion that has reduced catches, a group directly exposed when monsoon swells add to that disruption. Checking the radar before a fishing trip shows whether a cell is building over the Arabian Sea approach to Vizhinjam.
Kovalam and Shangumukham beach visitors
Kovalam and Shangumukham beach tourism has been directly hit by Vizhinjam-driven coastal erosion, a dependency inland Kerala cities don't share, making it worth timing a beach visit around both erosion and rain conditions. Checking the radar before heading to either beach shows whether a southwest or northeast monsoon cell is approaching the coast that day.
RainViewer Radar Coverage in Thiruvananthapuram
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. Coverage extends along the Malabar coast from Thiruvananthapuram north through Kollam and Kochi, and inland toward the Western Ghats foothills feeding the Karamana and Killi rivers.
Thiruvananthapuram Rain Radar: Frequently Asked Questions
- Is it raining in Thiruvananthapuram right now?
The only accurate answer is a live radar, because Thiruvananthapuram runs on two separate monsoon systems in the same year and rain can shift from a passing shower to river-linked flooding in wards like Vanchiyoor within the hour. A hyperlocal radar reading catches that shift directly, pulling India Meteorological Department (IMD) data that RainViewer refreshes every 5 minutes.
- Should I visit Kovalam or Shangumukham beach today?
Visiting Kovalam or Shangumukham beach is workable to plan around a live radar check, since both southwest and northeast monsoon cells can build quickly off the Arabian Sea even outside the peak June window. Checking the radar before heading out beats relying on a single seasonal average.
- Does rain affect the Technopark commute route?
Heavy monsoon cells over the Karamana-Killi river network can flood Sreekaryam and Medical College ward well before rain reaches Technopark itself, a route served by KSRTC buses along NH66. Checking the radar 20–30 minutes before commuting shows whether that specific stretch is passable.
- Does Thiruvananthapuram flood when it rains?
Yes — the Karamana and Killi rivers drive urban riverine flooding through named wards including Kattayikonam, Sreekaryam, Medical College, Shangumukham, Vanchiyoor and Kadakampalli, with the 2018 Kerala floods, the worst since 1924, pushing the state 42% above expected rainfall. Avoid these low-lying wards during heavy rain, and check the radar rather than assuming a citywide average applies to your street.
- When is the best time to visit Thiruvananthapuram to avoid rain?
Mid-December through May is Thiruvananthapuram's dry season, free of both the southwest monsoon's June peak and the northeast monsoon's October–December burst. Visiting during either monsoon still works, but checking the radar before a Kovalam or Shangumukham beach trip avoids a sudden coastal downpour.
- Why is rain in Thiruvananthapuram so hard to predict?
Thiruvananthapuram sees two separate monsoon systems in the same year — the southwest monsoon by around 1 June and a second northeast monsoon burst from around 20 October — and Kerala flood studies from 2018 and 2019 found the most extreme events correlate with mid- and upper-tropospheric convection that a standard surface forecast can't track. That dual-monsoon structure is why one ward like Sreekaryam can flood while nearby Kadakampalli stays dry.
- How often does the Thiruvananthapuram rain radar update?
RainViewer's hyperlocal radar for Thiruvananthapuram updates every 5 minutes, drawing on India Meteorological Department (IMD) data via mausam.imd.gov.in. That refresh rate is fast enough to catch a convective cell building over the Karamana-Killi river network before it reaches Vanchiyoor.
- Can I get a warning before rain hits Thiruvananthapuram?
Setting a rain alert for a specific point, such as a home near Vanchiyoor or a Technopark commute route, gives warning before a cell arrives instead of after. RainViewer fires that alert automatically once the radar detects the cell approaching, enough lead time to move to higher ground or delay a commute.
Track Rain in Thiruvananthapuram in Real Time
Every monsoon, the Karamana and Killi rivers can push Vanchiyoor, Sreekaryam and Medical College ward into flood within the hour.
Thiruvananthapuram runs on two separate monsoon systems a year, so a single seasonal average can't tell a Vanchiyoor resident or a Technopark commuter what's happening on their street right now. Only a live map catches the timing.
Your weather app says scattered showers for Thiruvananthapuram this afternoon. RainViewer shows a convective cell building over Sreekaryam, with Vanchiyoor likely to flood within the hour.
Track rain in Thiruvananthapuram — free Upgrade to Essential for alerts, forecasts, and full radar history
2-hour forecast in 5-minute slices
RainViewer's 2-hour forecast in 5-minute slices shows exactly when a convective cell over the Karamana-Killi network is likely to reach Vanchiyoor, in far finer steps than an hourly forecast.
Rain alerts before arrival
Set a rain alert for a home near Vanchiyoor or the Technopark commute route, and RainViewer fires it before the cell arrives, not after.
Direction arrows on the map
Direction arrows show whether an incoming cell is tracking in off the Arabian Sea from the west, the direction that brings both the southwest and northeast monsoon to the coast.
48 hours of radar history
48 hours of radar history shows how the last Karamana-Killi flooding event actually tracked across the city.
Multiple locations
Track a home near Vanchiyoor, the Technopark commute route, and Kovalam beach at the same time, each with its own alert.
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