IMD forecasts thunderstorms over Western Ghats; Chennai to see light rain on 11 July
Synopsis
Two active atmospheric troughs are driving unsettled weather across Tamil Nadu, with the IMD warning of thunderstorms and winds up to 50 kmph over Western Ghats districts on 11 July. Chennai faces light showers and temperatures up to 38°C, while parts of the state could run 2–3°C above normal between 12 and 14 July.
Key Takeaways
The IMD forecast moderate rain with thunderstorms and winds of 40–50 kmph over Western Ghats districts of Tamil Nadu on 11 July .
Two atmospheric troughs — one at 0.9 km and another between 1.5 km and 3.1 km — are driving the weather activity.
Chennai is expected to see partly cloudy skies with light thundershowers; maximum temperature forecast at 37–38°C .
Moderate rainfall at isolated Western Ghats locations is likely to continue from 12 July to 14 July ; dry conditions expected elsewhere.
Some parts of Tamil Nadu may record temperatures 2°C to 3°C above normal between 12 and 14 July .
The India Meteorological Department (IMD) on Saturday, 11 July forecast moderate rainfall accompanied by thunderstorms and gusty winds over the Western Ghats districts of Tamil Nadu, while Chennai and select other parts of the state are expected to receive light thundershowers later in the day. The forecast covers Tamil Nadu, Puducherry, and Karaikal through 15 July.
Active Weather Systems Behind the Forecast
According to the Regional Meteorological Centre (RMC), Chennai, two distinct weather systems are currently influencing rainfall across the region. A trough persisting at approximately 0.9 km altitude runs along the north Tamil Nadu coast, while a second trough — lying between 1.5 km and 3.1 km above mean sea level — stretches from Telangana to the east-central Arabian Sea off the Karnataka coast. Together, these systems are expected to sustain rainfall activity across parts of Tamil Nadu over the coming days.
What the IMD Forecast Says for 11 July
On Saturday, one or two places in the Western Ghats districts are likely to receive moderate rain with thunderstorms and gusty winds reaching speeds of 40 to 50 kmph. Isolated locations across the rest of Tamil Nadu, as well as Puducherry and Karaikal, may experience light rain with thunderstorms. Most other parts of the state are expected to remain dry through the day.
Outlook from 12 to 15 July
Moderate rainfall is forecast to continue at isolated places in the Western Ghats districts from 12 July to 14 July, while dry weather is expected to prevail over the rest of Tamil Nadu, Puducherry, and Karaikal during this period. On 15 July, the IMD has forecast light to moderate rain at isolated locations in the Western Ghats, with predominantly dry conditions elsewhere.
Temperature Outlook for Tamil Nadu
Maximum temperatures across Tamil Nadu, Puducherry, and Karaikal are expected to remain close to normal on Saturday with little likelihood of significant change. However, between 12 July and 14 July, some parts of Tamil Nadu could record maximum temperatures 2°C to 3°C above normal, while temperatures in remaining areas — including Puducherry and Karaikal — are likely to stay near seasonal averages.
Chennai-Specific Forecast
For Chennai, the IMD has forecast a partly cloudy sky on Saturday with the possibility of light rain accompanied by thunderstorms in a few parts of the city. The maximum temperature is expected to hover between 37°C and 38°C, while the minimum temperature is likely to remain between 27°C and 28°C. Residents in low-lying areas and commuters should remain alert to sudden gusty spells during afternoon and evening hours.
Point of View
And the IMD's five-day window forecast reflects growing confidence in mesoscale modelling. What the bulletin does not address is the cumulative heat stress building across interior Tamil Nadu — a 2–3°C above-normal temperature band running concurrently with thunderstorm risk is a public health signal, not just a weather note. Authorities in districts away from the Ghats, where dry and hot conditions dominate, would do well to activate heat action protocols rather than focus solely on the rain alerts.
NationPress
11 Jul 2026
Frequently Asked Questions
What has the IMD forecast for Tamil Nadu on 11 July?
The IMD has forecast moderate rain with thunderstorms and gusty winds of 40–50 kmph over Western Ghats districts of Tamil Nadu on 11 July. Isolated light thundershowers are also possible in Chennai, Puducherry, and Karaikal, while most other areas are expected to remain dry.
Which weather systems are causing the rain in Tamil Nadu?
Two atmospheric troughs are responsible — one persisting at around 0.9 km altitude along the north Tamil Nadu coast, and another between 1.5 km and 3.1 km above mean sea level stretching from Telangana to the Arabian Sea off the Karnataka coast. Both systems are expected to sustain rainfall activity over the coming days.
What is the weather forecast for Chennai on 11 July?
Chennai is expected to have a partly cloudy sky with the possibility of light rain and thunderstorms in some parts of the city. The maximum temperature is forecast between 37°C and 38°C, and the minimum between 27°C and 28°C.
How long will the rain last in Tamil Nadu's Western Ghats?
Moderate rainfall at isolated places in the Western Ghats is expected to continue from 12 July to 14 July. On 15 July, light to moderate rain is forecast for isolated Western Ghats locations, with dry conditions likely to prevail across the rest of Tamil Nadu, Puducherry, and Karaikal.
Will temperatures rise in Tamil Nadu this week?
Yes, between 12 July and 14 July, some parts of Tamil Nadu could record maximum temperatures 2°C to 3°C above normal. Puducherry and Karaikal, along with remaining areas, are likely to stay near seasonal temperature averages during this period.
