monsoon forecast

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Delhi recorded a “real feel” temperature of 51.3°C and a peak wet-bulb temperature of 29.77°C on Saturday, according to the India Meteorological Department (IMD), despite forecasts of weekend rainfall. The city’s maximum temperature reached 41.3°C—4.1°C above normal—while humidity levels fluctuated between 35% and 63%, creating conditions that experts warn could persist for days.

Why did Delhi’s heat index spike to 51.3°C?

Southwesterly winds from the Arabian Sea are carrying moisture over Pakistan and northwestern India, increasing humidity levels, according to Mahesh Palawat, vice president of Skymet Weather. The “feels-like” temperature remains elevated because the monsoon has not yet arrived—winds would shift from the Bay of Bengal if it were closer. The IMD confirmed the heat index peaked at 47.8°C by 5:30pm, while wet-bulb temperatures reached 29.77°C at 2:30pm, a level that makes prolonged outdoor work difficult for even acclimatized individuals.

Did You Know? A wet-bulb temperature of 35°C is the threshold where the human body can no longer regulate its own temperature, potentially leading to heat stroke or collapse.

What health risks do these conditions pose?

Wet-bulb temperatures above 32°C already strain outdoor laborers, and the current readings of 29.77°C approach that danger zone. The IMD’s data shows humidity levels between 35% and 63%—far from the dry heat typically associated with Delhi’s summer—amplifying the perceived heat. Experts warn that while the monsoon is expected after July 4, scattered rainfall could arrive as early as July 2 or 3, potentially easing conditions sooner.

Expert Insight: This heatwave underscores a growing trend in South Asian cities where urban heat islands and delayed monsoons create prolonged periods of extreme discomfort. Delhi’s infrastructure, designed for dry heat, struggles with high humidity, increasing risks for vulnerable populations.

What happens next with Delhi’s weather?

The IMD forecasts maximum temperatures between 39°C and 41°C until Monday, followed by a gradual decline to 33°C–35°C by Friday. Rainfall is predicted from Monday to Friday, accompanied by thunderstorms and strong winds, with a yellow alert issued for Tuesday and Wednesday. Minimum temperatures are expected to drop to 21°C–23°C by Friday, though humidity may linger until the monsoon arrives.

Palawat noted that while humidity could persist, “scattered rainfall by July 2 or 3 should reduce temperatures,” with the monsoon expected after July 4. The transition from dry to wet conditions typically brings relief, but the delay has prolonged the current heat stress.

How does this compare to normal summer patterns?

Delhi’s current maximum of 41.3°C is 4.1°C above normal, while the minimum of 30.8°C exceeds the average by 2.9°C. Historically, such prolonged high humidity is unusual for this time of year, as the city typically experiences drier heat before monsoon onset. The IMD’s forecast suggests this year’s delay in moisture shift from the Arabian Sea is a key factor.

Note: All temperature and humidity figures are sourced directly from the IMD and Skymet Weather.

Frequently Asked Questions

Q: Why does humidity make the heat feel worse?
A: Humidity reduces the body’s ability to cool through sweat evaporation. The heat index combines temperature and humidity to reflect the actual perceived temperature—51.3°C in Delhi on Saturday was the result of 41.3°C air temperature plus 35%–63% humidity.

Q: When will Delhi’s temperatures drop?
A: The IMD predicts a gradual decrease starting Monday, with maximum temperatures falling to 33°C–35°C by Friday. Scattered rainfall could arrive as early as July 2 or 3, further lowering temperatures.

Q: Is this heatwave dangerous?
A: Wet-bulb temperatures above 32°C pose risks to outdoor workers, and the current 29.77°C reading is approaching that threshold. At 35°C, the human body cannot regulate temperature, leading to heat stroke. Experts emphasize the need for hydration and shade during these conditions.

With monsoon rains still days away, how are you preparing for the heat in your city?

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