India has emerged as the focal point of an intense global heat surge, with nineteen out of the twenty warmest cities noted worldwide situated within its borders, according to data published by AQI.in on April 21, 2026, at 12:21 pm IST. The Indian Meteorological Department has issued warnings that heatwave conditions are expected to persist from April 22 to April 24, with maximum temperatures anticipated to rise further, potentially reaching up to 43 degrees Celsius.

A heatwave is officially declared when the maximum temperature exceeds 40 degrees Celsius. The current list is replete with cities from Bihar, Odisha, West Bengal, and Uttar Pradesh, with several locations recording alarmingly high temperatures of 44 degrees Celsius.

Bhagalpur in Bihar, Talcher in Odisha, and Asansol in West Bengal are at the top of the temperature rankings, each registering 44 degrees Celsius. Following closely are multiple cities in Bihar, such as Begusarai, Motihari, Munger, Bhojpur, and Siwan, along with regions in West Bengal and eastern Uttar Pradesh, all hitting temperatures around 43 degrees Celsius. Notably, the only city outside India making it to the top twenty is Lumbini in Nepal.

Factors Contributing to The High Temperatures

The simultaneous rise in temperatures across northern, central, and eastern India indicates a more extensive atmospheric trend rather than a series of isolated regional episodes. Meteorologists believe that a combination of factors is contributing to this extreme heat phenomenon. One significant element is the intense solar heating of the land, which has markedly elevated surface temperatures throughout April, traditionally a pre-monsoon heat period.

In many regions of northern and central India, clear skies are facilitating uninterrupted solar radiation, thereby intensifying the heat. Furthermore, the reduction in winter snow cover across Eurasia and the Himalayas is another critical factor. Less snow implies that sunlight is reflected back into space to a lesser extent, resulting in increased temperatures across the Indian subcontinent. This situation has hastened the onset and severity of heatwave conditions this year.

Additionally, shifts in ocean patterns, such as rising sea surface temperatures in the Pacific Ocean and a movement towards ENSO-neutral conditions, are having an influence on atmospheric circulation. This transition has diminished the effectiveness of systems that usually provide cooling effects, thereby allowing heat to build up over vast land areas.

Impacts and Implications of Rising Temperatures

The ongoing heat situation is exacerbated by dry northwesterly winds affecting the plains, which inhibit cloud development and diminish the likelihood of rainfall. In contrast, areas in southern and northeastern India are experiencing moisture flow and thunderstorms, creating a pronounced disparity in weather patterns across the country.

Experts have cautioned that such a concentration of extreme temperatures highlights a trend toward increased climate variability. With more than half of the world’s hottest cities now located in India, this growing trend signals a higher frequency and intensity of heatwaves.

As April progresses, the upcoming weeks are expected to pose considerable challenges, with ongoing heat stress likely to persist across substantial portions of the nation. Any significant relief from the escalating temperatures may only arrive with the onset of pre-monsoon conditions.

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