# Tamil Nadu weather: alternating heatwaves and heavy rain > Live situation record from CLSTR: https://clstr.news/situations/tamil-nadu-issues-repeated-heavy-rain-and-wind-alerts-as-the-southwest-monsoon-arrives > Updated: 2026-08-08T04:29:11.000Z. Sources: 35. Developments: 24. Since early May 2026, Tamil Nadu has experienced alternating periods of intense rainfall, strong winds, and extreme heat. The period began with heavy-rain and strong-wind warnings due to a trough and cyclonic circulation. While June and early July saw heavy rain in the Western Ghats and hilly districts, a weak southwest monsoon in July led to a pronounced heatwave with temperatures exceeding 40°C and record electricity demand. In early August, weather patterns shifted toward more frequent unsettled conditions. A weak low-pressure circulation brought forecasts for heavy rain and strong winds to western districts, including Coimbatore, Tirunelveli, Nilgiris, Theni, and Kanyakumari, through August 6. Although temperatures remained relatively high, some cooling was noted. By mid-August, thunderstorms and gusty winds of 40–50 km/h affected North Tamil Nadu, Puducherry, and Karaikal. Heavy showers and strong winds in districts such as Chengalpattu and Ranipet caused waterlogging on low-lying roads. Meteorological forecasts indicate that moderate rainfall and unsettled weather are expected to persist through August 14, providing continued relief from previous heatwaves while maintaining risks of localized flooding. ## Timeline ### 2026-08-08: Tamil Nadu and Puducherry face moderate rain and thunderstorms through August 16 Tamil Nadu and Puducherry face a week of moderate rain, thunderstorms, and gusty winds. Orange alerts are in effect for six districts as a low-pressure trough influences coastal and Western Ghats regions. 10 sources. https://clstr.news/cluster/tamil-nadu-and-puducherry-expect-continued-rainfall-through-august-14 ### 2026-08-04: Tamil Nadu braces for heavy rain and gusty winds in four districts Tamil Nadu's meteorological centre warns of heavy rain and gusty winds in four districts on Thursday‑Friday, with moderate rain elsewhere and temperatures up to 36 °C. 4 sources. https://clstr.news/cluster/sri-lanka-and-tamil-nadu-brace-for-heavy-rain-and-thunderstorms ### 2026-08-01: Tamil Nadu Western Districts Forecast Heavy Rain, Strong Winds to Aug 6 IMD forecasts heavy rain and strong winds in Tamil Nadu's western districts, including Coimbatore and Kanyakumari, until Aug 6, with temperatures near 38 °C and low flood risk. 2 sources. https://clstr.news/cluster/tamil-nadu-western-districts-forecast-heavy-rain-strong-winds-to-aug-6 ### 2026-07-24: Tamil Nadu Forecast: Rain in Western Ghats, Heat Advisory in Interior IMD forecasts moderate rain over Tamil Nadu’s Western Ghats through July 30 and issues a heat advisory for interior districts with temperatures up to 4 °C above normal. 4 sources. https://clstr.news/cluster/tamil-nadu-forecast-rain-in-western-ghats-heat-advisory-in-interior ### 2026-07-21: Tamil Nadu Weather Service Issues Rain and Thunderstorm Alerts for 26 Districts Tamil Nadu’s weather department warned of rain and thunderstorms for 26 districts, with a low‑pressure system expected to intensify over the next two days. 5 sources. https://clstr.news/cluster/tamil-nadu-weather-service-issues-rain-and-thunderstorm-alerts-for-26-districts ### 2026-07-18: Chennai and Western Ghats districts to see moderate rain and gusty winds through July 24 IMD predicts moderate rain for Tamil Nadu's Western Ghats through July 24, isolated showers elsewhere, near‑normal coastal temps, interior heat up to 3 °C above average, and gusty thunderstorms. 6 sources. https://clstr.news/cluster/tamil-nadu-and-chennai-to-receive-moderate-rain-and-thunderstorms-through-july-24 ### 2026-07-14: Tamil Nadu heatwave drives record electricity demand A heatwave across 19 Tamil Nadu districts prompted health warnings and a record 21,724 MW electricity demand on 16 July, with officials urging precautions and limiting fishing activity. 4 sources. https://clstr.news/cluster/madurai-hits-425c-in-record-heatwave-highest-in-india-this-week ### 2026-07-14: Tamil Nadu faces rising temperatures and reduced rainfall through July 16 Tamil Nadu will see temperatures 3‑4 °C above normal and limited rain through July 16, with highs over 41 °C and health advisories to avoid midday sun and stay hydrated. 4 sources. https://clstr.news/cluster/tamil-nadu-faces-rising-temperatures-and-reduced-rainfall-through-july-16 ### 2026-07-11: Tamil Nadu's Western Ghats expected light‑moderate rain while most of the state stays dry India's IMD forecasts light‑moderate showers in Tamil Nadu's Western Ghats through July 18, while most of the state, Puducherry and Karaikal stay dry with temperatures 2‑4 °C above normal and high humidity; the 6 sources. https://clstr.news/cluster/chennai-expects-light-rain-and-thunderstorms-as-imd-forecasts-moderate-showers-in-western-ghats ### 2026-07-08: Tamil Nadu heavy rains spark school closure talks and Nilgiris wind warnings Chennai's heavy rain fuels school‑closure speculation, while the IMD warns of intense rain, strong winds and landslide risk in Nilgiris and issues a marine warning for the Andaman Sea. 2 sources. https://clstr.news/cluster/tamil-nadu-heavy-rains-spark-school-closure-talks-and-nilgiris-wind-warnings ### 2026-07-06: India's IMD forecasts moderate rain in Tamil Nadu's Western Ghats and higher temperatures India's IMD says Tamil Nadu's Western Ghats will receive moderate rain with thunderstorms and gusty winds for the next two days, while most of the state sees light rain and temperatures 2‑3 °C above normal. 6 sources. https://clstr.news/cluster/tamil-nadu-and-chennai-forecast-moderate-rain-and-higher-temperatures-amid-monsoon-trough ### 2026-06-21: Tamil Nadu forecasts heavy rain across six districts for a week Tamil Nadu’s Chennai meteorological centre warns of a week‑long spell of heavy rain and strong winds in six districts, with moderate rain elsewhere, urging residents to stay alert. 2 sources. https://clstr.news/cluster/tamil-nadu-forecasts-heavy-rain-across-six-districts-for-a-week ### 2026-06-19: India Meteorological Department forecasts pre‑monsoon rain and thunderstorms in Tamil Nadu and Delhi The IMD forecasts light rain, thunderstorms and gusty winds in Tamil Nadu and Delhi, with temperatures below 40 °C and moderate air quality, offering relief from pre‑monsoon heat. 5 sources. https://clstr.news/cluster/india-meteorological-department-forecasts-premonsoon-rain-and-thunderstorms-in-tamil-nadu-and-delhi ### 2026-06-18: Chennai and surrounding districts hit by heavy rain and thunderstorms Heavy rain, thunderstorms and strong winds are forecast for Chennai and 12 nearby districts, with a fishermen advisory for coastal waters until June 21. 3 sources. https://clstr.news/cluster/chennai-and-surrounding-districts-hit-by-heavy-rain-and-thunderstorms ### 2026-06-16: Heavy rain forecast for 13 districts in Tamil Nadu through June 18 Tamil Nadu's RMC forecasts heavy rain with thunderstorms in 13 districts, including Theni, from June 16‑18, urging caution for potential flooding and landslides. 2 sources. https://clstr.news/cluster/heavy-rain-forecast-for-13-districts-in-tamil-nadu-through-june-18 ### 2026-06-15: Tamil Nadu forecasts storms and strong winds as temperatures climb Tamil Nadu's weather office warns of thunderstorms, strong winds up to 50 km/h and heavy rain in multiple districts as temperatures rise to around 40 °C. 3 sources. https://clstr.news/cluster/tamil-nadu-forecasts-storms-and-strong-winds-as-temperatures-climb ### 2026-06-13: Tamil Nadu faces moderate rain and strong winds as cyclonic system moves across state A cyclonic circulation over north coastal Tamil Nadu is forecast to bring moderate rain, thunderstorms and strong winds across the state, with heavier downpours in the Cauvery Delta districts. 4 sources. https://clstr.news/cluster/tamil-nadu-faces-moderate-rain-and-strong-winds-as-cyclonic-system-moves-across-state ### 2026-06-11: Tamil Nadu braces for heavy rains across 15+ districts Heavy rain with thunderstorms, lightning and 40‑50 km/h gusts is forecast for 15+ districts in Tamil Nadu from June 11‑14, with temperatures dropping and Chennai expecting hot, humid conditions; recent rains up 3 sources. https://clstr.news/cluster/tamil-nadu-braces-for-heavy-rains-across-15-districts ### 2026-06-09: Tamil Nadu faces heavy rain and thunderstorms across ten districts Heavy rain and thunderstorms are forecast for ten Tamil Nadu districts, with gusts up to 50 km/h, while Chennai sees moderate rain and persistent heat and humidity. 2 sources. https://clstr.news/cluster/tamil-nadu-faces-heavy-rain-and-thunderstorms-across-ten-districts ### 2026-06-06: Tamil Nadu braces for heavy rain and strong winds through June 9, fishermen warned Tamil Nadu, Puducherry and Karaikal face heavy rain and strong winds until 9 June, with marine warnings for fishermen. 5 sources. https://clstr.news/cluster/tamil-nadu-faces-heavy-rain-and-strong-winds-until-june-9-fishermen-alerted ### 2026-06-02: Tamil Nadu issues heavy rain warning for 22 districts Tamil Nadu's RMC warned of a week‑long heavy‑rain spell with thunderstorms for 22 districts and Puducherry, urging residents to stay alert and follow safety measures. 2 sources. https://clstr.news/cluster/tamil-nadu-issues-heavy-rain-warning-for-22-districts ### 2026-05-24: Tamil Nadu braces for heavy to very heavy rainfall across multiple districts Tamil Nadu faces heavy to very heavy rain across 10 districts today, with forecasts expanding to many more areas over the next two days; officials warn of possible localized flooding. 3 sources. https://clstr.news/cluster/tamil-nadu-braces-for-heavy-to-very-heavy-rainfall-across-multiple-districts ### 2026-05-21: India Meteorological Department warns of heavy rain across Tamil Nadu districts IMD alerts heavy rain for Tamil Nadu districts, warning of landslides and gusty winds as the wet spell continues. 2 sources. https://clstr.news/cluster/india-meteorological-department-warns-of-heavy-rain-across-tamil-nadu-districts ### 2026-05-06: Tamil Nadu issues heavy rain and strong wind alert for multiple districts Tamil Nadu's RMC warns of heavy rain and strong winds in many districts, urging caution for landslides and fishermen. 2 sources. https://clstr.news/cluster/tamil-nadu-issues-heavy-rain-and-strong-wind-alert-for-multiple-districts --- Cite as: Tamil Nadu weather: alternating heatwaves and heavy rain. CLSTR, https://clstr.news/situations/tamil-nadu-issues-repeated-heavy-rain-and-wind-alerts-as-the-southwest-monsoon-arrives