What are the temperature thresholds for declaring a heatwave in India?

Heatwave conditions are declared based on regional temperature thresholds: ≥40°C for plain regions, ≥37°C for coastal regions, and ≥30°C for hilly regions.

How does the urban heat island effect impact heatwaves in Indian cities?

The urban heat island effect causes cities to experience higher temperatures than surrounding areas, exacerbating heatwave conditions due to factors like dense construction and lack of green spaces.

What measures are being taken in India to combat heatwaves?

India has implemented Heat Action Plans (HAPs) with early warning systems and public health responses, and launched the 'India Cooling Action Plan' to promote sustainable cooling solutions.

Home / Environment / Delhi Swelters: Heatwave Grips NCR with Rising Temps

Delhi Swelters: Heatwave Grips NCR with Rising Temps

23 Apr

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Summary

Delhi-NCR heatwave likely from April 23-25, temps to rise.
Heatwaves are defined by temperature thresholds varying by region.
India's workforce of 380 million faces heightened heat exposure.

Delhi Swelters: Heatwave Grips NCR with Rising Temps

Delhi-NCR is anticipated to experience persistent heatwave conditions from April 23 to 25, 2026, as maximum temperatures are projected to rise by 1-2°C, remaining above normal for at least five days. This early April heatwave, with temperatures already hovering between 40°C and 42°C, raises questions about broader climatic shifts and anthropogenic impacts.

Heatwave conditions are defined by temperature thresholds: ≥40°C for plains, ≥37°C for coastal, and ≥30°C for hilly regions. Departures of 4.5°C to 6.4°C from normal are considered heatwaves, with over 6.4°C signaling severe heatwaves. India's tropical location and high population density make it highly vulnerable to these events.