Tamil Nadu, Puducherry thunderstorms and rain forecast for 4 days, heat to rise 3°C
Synopsis
Tamil Nadu and Puducherry face a rare double weather threat: thunderstorms and gusty winds through May 30, while temperatures simultaneously climb up to 3°C above normal. Chennai is expected to touch 41°C, and health authorities are already flagging dehydration and kidney-risk warnings — a sign that pre-monsoon stress on the region is intensifying.
Key Takeaways
The Regional Meteorological Centre (RMC), Chennai has forecast moderate rain with thunderstorms across Tamil Nadu and Puducherry from Wednesday through 30 May .
Light to moderate rainfall is also expected on 31 May and 1 June at isolated locations.
Maximum temperatures may rise by up to 3°C above normal over the next four days, with Chennai expected to touch 41°C .
Coastal districts face the worst of the heat-humidity combination, particularly during afternoon hours.
Health authorities have warned of dehydration and kidney-related risks, urging residents to stay hydrated and avoid peak-hour sun exposure.
The Regional Meteorological Centre (RMC), Chennai, has forecast moderate rainfall accompanied by thunderstorms, lightning, and gusty winds across scattered parts of Tamil Nadu and Puducherry over the next four days, even as daytime temperatures are projected to climb by up to 3 degrees Celsius above normal in many districts. The dual threat of intermittent storms and rising heat is expected to create uncomfortable conditions, particularly along coastal areas.
Rainfall Forecast: Wednesday to June 1
Scattered locations across Tamil Nadu and Puducherry are likely to receive moderate rain with thunderstorm activity from Wednesday through 30 May. Isolated areas may also experience strong surface winds during this period due to shifting atmospheric conditions over the region.
Weather activity is expected to ease slightly but persist, with light to moderate rainfall forecast at one or two places across both territories on 31 May and 1 June. The RMC has indicated it will continue monitoring conditions closely and issue further advisories if warranted.
Heat Warning: Temperatures to Stay Above Normal
Despite the rain activity, maximum temperatures across Tamil Nadu and Puducherry are expected to rise by as much as 3°C over the next four days, sustaining hot and humid conditions — especially in coastal districts. In Chennai, the maximum temperature is projected to hover around 41 degrees Celsius, with humidity levels likely to remain elevated throughout the day.
Officials noted that the combination of heat and high moisture content could cause significant discomfort, particularly during afternoon hours. This pattern is consistent with the pre-monsoon transition period that typically grips the Tamil Nadu coast in late May.
Health Advisory for Residents
Health authorities have urged the public to exercise caution during periods of intense heat and humidity. Key advisories include staying adequately hydrated — even for those working in air-conditioned environments who may not feel thirsty — as insufficient water intake during hot weather can lead to dehydration and heighten the risk of kidney-related complications.
Residents have also been advised to avoid unnecessary exposure to direct sunlight during peak daytime hours, wear light cotton clothing, and ensure proper ventilation in homes and workplaces. Authorities particularly flagged the risk for outdoor workers and the elderly.
What to Watch Next
The RMC is expected to issue updated bulletins as atmospheric conditions evolve through the first week of June. With the southwest monsoon's onset over Kerala typically occurring around 1 June, any early advance could alter the current forecast trajectory for Tamil Nadu. Residents and local administrations are advised to stay tuned to official weather updates.
Point of View
But the scale — a 3°C temperature spike alongside active convective activity — underscores how the transition period is becoming more volatile. What the advisory gets right is the health framing: the real risk is not the storm but the humid heat that follows, which historically strains public health infrastructure in Chennai's dense residential corridors. The RMC's commitment to continuous monitoring is reassuring, but district-level preparedness — particularly for outdoor labour and the urban poor without ventilation — remains the accountability gap that official bulletins rarely address.
NationPress
12 Jul 2026
Frequently Asked Questions
Which areas will be affected by thunderstorms in Tamil Nadu and Puducherry?
Scattered locations across Tamil Nadu and Puducherry are likely to experience moderate rain with thunderstorms, lightning, and gusty winds from Wednesday through 30 May, according to the RMC Chennai forecast. Isolated areas may also see strong surface winds due to changing atmospheric conditions.
How high will temperatures rise in Tamil Nadu over the next four days?
Maximum temperatures across Tamil Nadu and Puducherry are expected to increase by up to 3 degrees Celsius above normal over the next four days. In Chennai specifically, the maximum temperature is projected to hover around 41 degrees Celsius with high humidity.
Will it rain in Tamil Nadu on May 31 and June 1?
Yes, the RMC has forecast light to moderate rainfall at one or two places across Tamil Nadu and Puducherry on 31 May and 1 June as weather activity continues intermittently after the main thunderstorm period.
What health precautions have been advised during this weather period?
Health authorities have advised residents to stay well-hydrated even if they do not feel thirsty, avoid direct sunlight during peak afternoon hours, wear light cotton clothing, and ensure proper ventilation indoors. Authorities warned that dehydration in hot and humid conditions can increase the risk of kidney-related complications.
Why is it both raining and hot at the same time in Tamil Nadu?
This is characteristic of Tamil Nadu's pre-monsoon transition period in late May, when warm moist air from the Bay of Bengal triggers convective thunderstorms while daytime heating simultaneously pushes temperatures above normal. The combination produces high humidity alongside intermittent storms rather than sustained cooling rainfall.
