UPSC Notes

Heat Stress and Heatwaves

PYQs

6

Articles

1

Momentum

17

Phase IFoundation

Background

Overview

Critical for understanding the impacts of climate change, public health challenges, disaster management, and socio-economic vulnerabilities. Relevant for GS1 (Geography, Urbanization), GS2 (Welfare, Disaster Management), GS3 (Environment, Economy).

Heat stress refers to the body's inability to cool itself, leading to heat-related illnesses, while heatwaves are periods of abnormally high temperatures. These extreme weather events are becoming more frequent, longer-lasting, and intense globally due to climate change.

Phase IIStatic core

Facts & tables

Key facts

Increasing Trend

Increasing frequency, intensity, and duration over the past decade in India, including Tamil Nadu, with average summer temperatures rising by 0.5-0.9°C in hotspots.

Contributing Factors

Amplified by high humidity, Urban Heat Island (UHI) effect, strong pre-monsoon solar heating, dry continental air, and delayed southwest monsoon activity.

Impacts

Significant impact on vulnerable populations (outdoor workers, children, elderly), affecting productivity, health, and increasing risk of heat-related illnesses.

El Nino Influence

Strengthening El Nino conditions in the tropical Pacific could influence weather patterns, rainfall, and heat risks, potentially extending warm temperatures.

Reference table

Regional Heat Stress Variations in India (May 2026)

RegionObserved Conditions
Tamil Nadu (North & Interior)Persistent heatwave-like conditions, 40+°C, high humidity along coast
TelanganaIntense heatwave conditions, 48 heat-related fatalities
Southwest Uttar Pradesh, Madhya Pradesh, Marathwada, VidarbhaSevere heat, Banda (UP) recorded 48.3°C
Western RajasthanDid not witness extreme temperatures this year

Reference table

Static syllabus anchors

TypeReference
Conceptual areaClimate Change Impacts
Conceptual areaDisaster Management

Reference table

Institutions & roles

BodyRole
India Meteorological Department (IMD)Monitors and forecasts weather, issues warnings
Regional Meteorological Centre (RMC)Provides regional weather observations and forecasts
Tamil Nadu State Disaster Management AuthorityCoordinates disaster response and preparedness
Phase IIIExam lens

Prelims angle

Overview

Prelims angle: Multi-statement analysis

Prelims angle: Conceptual understanding

Quick revision

  • Increasing frequency/intensity of heatwaves due to global warming.
  • UHI effect and high humidity amplify heat stress.
  • Impacts: public health, labor productivity, vulnerable groups.
  • El Nino's potential influence on future heat risks.
  • Need for early warning systems and localized action plans.

High-confidence PYQs

Topic timeline

Climate Change ImpactsDisaster Management

Beyond high temperatures: understanding heat stress in Tamil Nadu

14 Jun 2026 · Heat stress and heatwaves are escalating extreme weather events, driven by climate change and local factors like UHI. They pose severe public health, economic, and disaster management challenges, necessitating robust adaptation and mitigation strategies.

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Related topics

Practice writing on this topic

UPSC has asked 6 linked questions on Heat Stress and Heatwaves in Mains. Write an answer to one — and get it evaluated.