Severe Heatwave Alert in India: IMD Warnings for Northwest and Central Regions as Delhi Exceeds 40°C

India is currently in the grip of an early and intense heatwave sweeping across its northwest and central regions, with the India Meteorological Department (IMD) issuing urgent warnings for prolonged high temperatures. As of late April 2026, cities like Delhi have already seen mercury levels soaring past 40 degrees Celsius, marking one of the hottest starts to the summer season in recent years. This severe weather event has prompted heightened alerts, especially in urban centers where the combination of scorching days and warm nights is amplifying discomfort and health risks for millions.

The IMD defines a heatwave as a period when the maximum temperature reaches at least 40°C in the plains and departs from the normal by 4.5°C or more, or when it hits 47°C regardless of departure in some cases. In hilly regions, the threshold drops to 30°C with a similar departure. Current conditions meet and exceed these criteria in multiple states, with forecasts indicating no immediate relief until early May.

🌡️ Regions Bearing the Brunt

Northwest India, including Punjab, Haryana, Chandigarh, Delhi, Rajasthan, and Uttar Pradesh, is experiencing the most severe impacts. Temperatures have consistently hovered between 42°C and 45°C, with Sri Ganganagar in Rajasthan recording a blistering 44.5°C recently. Central states like Madhya Pradesh, Chhattisgarh, and Vidarbha are also affected, where isolated pockets have seen heatwave to severe heatwave conditions.

In Delhi, the national capital recorded its hottest day of 2026 at 42.8°C, with projections for 44°C over the weekend. Warm nights—where minimum temperatures remain above 30°C—are exacerbating the situation, preventing the body from cooling down overnight. IMD's extended outlook warns of heatwave persistence until April 28 or 29, followed by a gradual drop of 3-5°C by May 1-2.

Affected Populations and Emerging Health Concerns

While official heatstroke death tallies for this early-season heatwave are still emerging, past patterns suggest underreporting. In 2025, India recorded at least 84 confirmed heatstroke deaths from February to July, with thousands more suspected. Vulnerable groups—construction workers, daily wage laborers, the elderly, children, and the homeless—are at highest risk. Heatstroke occurs when the body's core temperature rises above 40°C due to failed thermoregulation, leading to symptoms like dizziness, nausea, rapid heartbeat, and confusion if untreated.

Hospitals in Delhi and other hotspots are preparing for surges in cases of dehydration, heat exhaustion, and exhaustion. The condition progresses rapidly: first, excessive sweating and fatigue; then, if ignored, cessation of sweat, hot dry skin, and potential organ failure. Early intervention with cooling, hydration, and medical aid is critical, as mortality can reach 40-64% in severe cases.

Government Responses and Heat Action Plans in Action

Delhi Chief Minister Rekha Gupta has activated the Heat Wave Action Plan 2026, aiming for zero heat-related deaths by 2030. Measures include over 30 hospitals with dedicated 'cool rooms' equipped with five beds each, 339 health centers on high alert, 330+ ambulances, misting systems at public spaces, and water ATMs citywide. Outdoor laborers get mandatory breaks from 1-4 PM, schools distribute ORS packets, and a 24x7 helpline provides assistance. Thermal hotspots identified via satellite data are prioritized for interventions like cool roofs and shaded areas.

Similar plans are rolling out in Uttar Pradesh, Rajasthan, and Madhya Pradesh. Rajasthan has ramped up water tankers and community shelters, while Madhya Pradesh focuses on rural awareness campaigns. The National Disaster Management Authority (NDMA) guidelines emphasize early warning systems, urban greening, and capacity building. For detailed advisories, check the IMD Heatwave Guidance page.

Practical Prevention Tips to Stay Safe

• Stay hydrated by drinking water frequently, even if not thirsty; avoid caffeine and alcohol.
• Avoid direct sun exposure between 12 PM and 4 PM; use umbrellas, hats, and light clothing.
• Recognize symptoms early: Move to shade, loosen clothes, apply cool water to skin, and seek help if severe.
• Use fans or air conditioning if available; take cool showers.
• Check on vulnerable neighbors, especially the elderly and infants.
• For workers: Schedule heavy tasks for cooler hours and ensure shaded rest areas.

IMD advises: 'Stay indoors when possible, keep cool, and drink plenty of fluids.'

Photo by John Bogna on Unsplash

Agricultural Impacts and Farmer Challenges

Rabi crops like wheat, already harvested in many areas, face post-harvest losses from drying, but standing crops in delayed regions risk yield drops of 10-20%. Heat stress accelerates grain filling but reduces quality. Irrigation demands spike, straining groundwater in Punjab and Haryana. Vegetable growers report wilting tomatoes and okra, pushing prices up.

Farmers in Madhya Pradesh share stories of livestock distress—cows refusing feed, poultry mortality rising. The government has advised mulching, light irrigation, and shade nets. Long-term, climate-resilient varieties and drip systems are promoted, but smallholders struggle with costs. A recent FAO-WMO report highlights how extreme heat threatens global agrifood systems, urging adaptation in India.

Urban Strains: Power, Water, and Infrastructure

Power demand has surged 15-20% in Delhi-NCR, leading to peak-hour restrictions. Air conditioners strain grids, causing outages in Rajasthan and UP. Water levels in reservoirs are low due to poor winter rains, prompting tanker supplies in urban slums.

Delhi's plan includes increased supply and rooftop rainwater harvesting incentives. Traffic snarls worsen under heat, with roads buckling in isolated spots. Public transport adds AC coaches where possible.

Historical Context and Worsening Trends

This heatwave is unusually early, arriving weeks ahead of typical May peaks. In 2024, India saw over 40,000 suspected heatstroke cases and 100+ deaths; 2025 had 84 confirmed. IMD forecasts above-normal heatwave days April-June 2026 in east, central, and northwest India.

Frequency has doubled since 1980s, linked to climate change. Urban heat islands amplify effects by 2-5°C in cities.

The Climate Change Connection

Global warming loads the atmosphere with moisture, stalling weather systems and prolonging dry spells. India's average temperatures have risen 0.7°C since 1901, with extremes intensifying. Studies project 2-4x more heatwave days by 2100 without mitigation. Adaptation like green corridors and cool pavements is key, alongside emission cuts.

Experts from IITs note local factors: depleted soil moisture, urbanization, and El Niño remnants.

Outlook: Relief on the Horizon?

IMD predicts abatement post-April 28, with thunderstorms possible in central India 27-30 April and monsoon onset by June. However, seasonal outlook warns of more heatwave days. Western disturbances may bring brief relief early May.

Stakeholders urge sustained vigilance. For official forecasts, refer to IMD's latest press release.

Photo by Jason Mayer on Unsplash

As this heatwave unfolds, proactive measures and community support will mitigate worst outcomes. Stay informed, stay cool, and prioritize safety amid rising temperatures.