Nautapa 2026 Explained: Why North India Is Under Severe Heatwave Alert From May 25

The term Nautapa literally translates to "nine hot days" (Nau meaning nine, and Tapa meaning burning heat). It is culturally and traditionally driven from the Indian Vedic astronomy.  Nautapa marks the period when the Sun enters the Rohini Nakshatra (constellation)

During Rohini Nakshatra transition phase the Earth comes closest to the Sun in its local celestial trajectory over the Indian subcontinent because the Sun’s rays fall almost vertically on North and Central India during this specific window, solar radiation is maximized.

Historically, Nautapa is significant for the agrarian community and used in traditional Indian folklore suggests that the more intensely the earth burns during these nine days, the better and more robust the upcoming monsoon season will be due to the massive low-pressure build-up over the mainland.

When Will Nautapa 2026 Begin and End?

In 2026, the astronomical transition of the Sun into the Rohini Nakshatra occurred on May 25, 2026. Consequently, Nautapa will remain active for exactly nine days, concluding on June 2, 2026 during this timeframe, the diurnal (daytime) temperatures are expected to reach their annual peak, with very little radiative cooling occurring even after sunset.

Why Is North India Expected to Face Severe Heatwave Conditions?

The extreme heatwave forecast by IMD for North India during Nautapa 2026 is a combination of celestial alignment, geographic conditions, and atmospheric factors:

• Vertical Solar Radiation: The angle of incidence of sunlight is at its highest, delivering maximum solar thermal energy per square meter known as Summer Solstice. 

• Dry, Westerly Winds: Hot, dry winds originating from the desert regions of Pakistan and Rajasthan often called a Loo a dry and hot wind sweep across the Indo-Gangetic plains.

• Absence of Western Disturbances: The IMD notes a distinct lack of active Western Disturbances because of that there are no cloud covers or sudden thundershowers to block the sun or cool lower atmosphere.

• Urban Heat Island (UHI) Effect: Concrete surfaces and lack of green cover in major northern cities trap day-time heat, and no air transition causing night temperatures to stay dangerously elevated.

Which States Are Under Heatwave Alert During Nautapa 2026?

The IMD has issued "Orange" and "Red" alerts for several regions in North India and central Indian states includes: 

According to the IMD’s scientific article a heatwave is declared when the maximum temperature of a station reaches at least 40°C for plains and departures from normal are between 4.5°C to 6.4°C.

For Nautapa 2026, the IMD has warned of a Severe Heatwave, indicating that temperatures will overshoot normal baselines by more than 6.4°C, or absolute temperatures will persistently scale past the mid-40s across multiple meteorological subdivisions. The weather body advises avoiding outdoor exposure between 11:00 AM and 4:00 PM unless absolutely necessary.

How Hot Can Temperatures Rise During Nautapa?

In India, regions like Phalodi and Churu in Rajasthan, along with parts of Delhi and Banda in Uttar Pradesh have recorded extreme temperatures scaling up to 48°C to 50°C during late May heatwaves for Nautapa 2026, climatologists predict that:

Plains of Rajasthan and Madhya Pradesh Mercury could hover between 46°C and 49°C, Delhi-NCR, Haryana, and Punjab can see peak daytime temperatures are projected to range between 45°C and 47°C and minimum night temperatures expected to stay around 30°C to 32°C, offering zero ambient relief to citizens.

Why Nautapa Is Considered the Hottest Period of the Year

Nautapa perfectly coincides with the meteorological transition( Summer Solstice a phenomena when sun rays in Northern Hemisphere tilts closest to the Sun and directly over the head causing the Sun's direct rays to be exactly vertical over theTropic of Cancer)  from late spring to peak summer right before the onset of the Southwest Monsoon.

The landmass of Northern India has already been baking under the sun throughout April and May. By May 25, the soil moisture is completely depleted without moisture to absorb the sun's energy via evaporation, all incoming solar radiation goes directly into heating the ground and the air, making Nautapa the undisputed hottest period of the year.

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