Night Heat Waves India: From Punjab to Odisha, the country is sweltering in the sun. Efforts to avoid the daytime heat will now continue at night, as a nighttime heatwave alert has been issued, which is even more dangerous than daytime heatwaves.

Stay away from the night heat

The heat in India has already made April miserable. Tourists have disappeared from Udaipur in Rajasthan, leaving the streets deserted. School timings have been changed due to heat waves in 26 districts of Uttar Pradesh. Temperatures have risen above 40 degrees Celsius in nine districts of Bihar. Heat waves are on alert across the country, including Chhattisgarh, Haryana, Punjab, Jharkhand, and Himachal Pradesh. For the first time, a night heat wave ultimatum has been issued in Madhya Pradesh, but heat waves occur in the sun, so what's the point of night heat waves? Let's find out in this explainer...

Question 1: How severe is the current heat wave in India?
Answer: Heatwaves have broken records in many parts of the country in the last week of April 2026. Temperatures in many places in states like Rajasthan, Madhya Pradesh, Uttar Pradesh, Maharashtra, Chhattisgarh, Odisha, and Bihar have reached 40 to 44 degrees Celsius. Prayagraj recorded 44.4 degrees Celsius, Bilaspur in Chhattisgarh 43.8 degrees Celsius, and many places have reached 42-43 degrees Celsius. The Meteorological Department has issued a heatwave alert in these states. Most notably, Madhya Pradesh issued a 'night heatwave' alert for the first time on Tuesday.

This alert is in effect in 16 districts of Madhya Pradesh, including Bhopal, Chhindwara, Mandla, Narmadapuram, Gwalior, Ratlam, and Chhatarpur. Previously, on Sunday and Tuesday nights, night temperatures in these areas were much higher than normal, providing residents with no respite from the day's heat. In Maharashtra and Odisha, signal systems were shut down during the day to prevent people from standing in the sun at intersections.

Night heat wave alert issued in 16 districts of Madhya Pradesh

Question 2: While a heat wave always occurs during the day with sunshine and hot air, what is a night heat wave like?
Answer: A typical heat wave occurs during the day. It's characterized by intense sunlight and hot, dry air that can reach 40 degrees Celsius or higher in the afternoon. However, a night heat wave, or "hot night," is quite different. It doesn't blow like the wind; rather, the night temperature remains so high that the walls, ground, and air don't cool down even after sunset.

According to the Meteorological Department, when the daytime temperature is 40 degrees or more and the nighttime minimum temperature is 4.5 to 6.4 degrees above normal, it is considered a "hot night." If it is above 6.4 degrees, it is considered a "very hot night." This is precisely what is happening in Madhya Pradesh. The heat persists even at night, with no cooling.

Question 3: What effect does nighttime heat have on the body compared to daytime heat?
Answer: Yes, nighttime heat causes even more subtle harm than daytime heat. The body heats up during the day, but if the temperature doesn't drop at night, it doesn't get a chance to cool down. The body's temperature-regulating system becomes exhausted. This increases pressure on the heart, kidneys, and brain. People can't sleep due to restlessness, sweat profusely, and feel tired upon waking in the morning.

In severe cases, dizziness, vomiting, fainting, and symptoms of heat stroke may appear. According to the Meteorological Department and doctors, hot nights can lead to sleep deprivation, which weakens the body the next day. The elderly, children, pregnant women, and those with pre-existing medical conditions are particularly affected.

Heatstroke can cause serious symptoms in the body.

Question 4: Is night heat considered more dangerous than day heat? If yes, why?
Answer: The day heat is intense, but there is relief at night. The body gets time to recover by getting cool at night, but when the night is also hot, this recovery does not happen. Heat stress continuously increases. Many research studies have been done on this, according to which, due to climate change, nights are getting hotter faster than days. Due to high humidity in the air, the day's heat gets trapped at night. In cities, concrete and buildings absorb heat during the day and release it at night.

The result? Consistent heat for several days increases the risk of death. Another study suggests that if nighttime heat increases, heat-related deaths could increase sixfold by the end of the century. Nighttime heat also robs people of sleep. On average, each person is sleeping 44 hours less per year.

Question 5: How long will you have to endure night heat, and what should you do to avoid it?
Answer: Night heat can cause symptoms like extreme thirst, fatigue, headache, dizziness, vomiting, increased body temperature, confusion, or fainting. Be aware of excessive night sweats, difficulty sleeping, or weakness in the morning:

• Drink more water at night also.
• Wear light, loose clothing.
• Run a fan or cooler in the room, keep the windows open.
• Do not go out between 12 noon and 4 pm.
• Keep a special eye on the elderly and children.
• Hospital beds are being reserved. School timings have been changed in many states, and laborers are not allowed to work in the afternoon.

According to the Meteorological Department, heat will persist in North and Central India for the next 4-5 days. Heatwave alerts have been issued for Madhya Pradesh, Uttar Pradesh, Rajasthan, and Odisha for hot nights. Climate change has made such weather more common. If there is no rain, the situation could worsen. Governments and the Meteorological Department are constantly monitoring the situation. People are being advised not to underestimate the heat, as it can silently take lives.

The night heat wave isn't just a breeze, but rather a persistent heat wave that doesn't allow the body to cool down. Unlike the daytime heatwave, it causes persistent fatigue and proves more dangerous in the long run. This alert has been issued for the first time in Madhya Pradesh because night temperatures are much higher than normal.