India's monsoon appears slow, tired: What the 30% rain deficit means

India received 30 per cent less rain than normal between June 4 and July 4, 2026, IMD data shows. Here is the science behind the missing monsoon and what it means for farmers, water supply and the weeks ahead.

In Short

• India received 131.4 mm rain against normal of 188.5 mm
• El Nino and missing low pressure systems weakened the monsoon
• July rains and Indian Ocean Dipole could narrow the deficit

Something has gone quiet over India this monsoon. The dark, brooding clouds that should have been soaking the country by now have largely stayed away. Between June 4 and July 4, India received 131.4 mm of rainfall against a normal of 188.5 mm, according to the India Meteorological Department's (IMD) rainfall monitoring data. That is a shortfall of 30 per cent.

The number sounds abstract. The consequences are not. This is the water that fills India's reservoirs, recharges its groundwater, and decides whether millions of farmers sow on time.

WHAT DOES A 30 PER CENT RAIN DEFICIT MEAN?

The IMD compares actual rainfall with the Long Period Average, or LPA, which is the average rainfall recorded over several decades and used as a benchmark for what is normal. Anything between 20 and 59 per cent below this average falls in the deficient category. India, as a whole, is squarely in that band.

A national average, however, hides enormous regional differences. Some districts are drenched while others are parched. June 2026 was the fifth-driest June since records began in 1901, with the country receiving just 99.5 mm of rain, about 40 per cent below normal.

East and northeast India recorded their lowest June rainfall ever, while central India saw its seventh-driest June on record.

WHY IS THE MONSOON SO WEAK IN 2026?

The IMD has pointed to the absence of any low-pressure systems during June. These are swirling pockets of low air pressure, usually born over the Bay of Bengal, that travel inland and dump widespread rain over central and eastern India. Without them, the monsoon loses its delivery trucks.

An unfavourable phase of the Madden-Julian Oscillation added to the problem. The Madden-Julian Oscillation, or MJO, is a giant pulse of clouds and rainfall that circles the equator every 30 to 60 days. When it moves away from the Indian Ocean, it takes the rain-making energy with it.

Then there is El Nino, the unusual warming of the central and eastern Pacific Ocean that tends to weaken the winds carrying moisture towards India. The IMD says evolving El Nino conditions, along with above-normal typhoon activity over the western Pacific, suppressed rain-bearing systems over the Indian Ocean.

CAN JULY RAINS RECOVER THE DEFICIT?

July is climatologically India's wettest month, with an average of 280.4 mm of rain. But the IMD expects July 2026 rainfall to stay below 94 per cent of the LPA, which is below normal.

There is still hope. The monsoon does not fall evenly. It arrives in bursts, and a few well-organised systems can shrink a deficit within weeks.

IMD chief Mrutyunjay Mohapatra has said a positive Indian Ocean Dipole, a see-saw of warm and cool waters in the Indian Ocean, could counter El Nino towards the end of August and in September.

WHAT DOES THE RAIN DEFICIT MEAN FOR FARMERS?

July is the main sowing window for kharif crops such as paddy, pulses, oilseeds and cotton. When rain fails, soil dries out first, stressing crops and heating the land further, as studies over India's core monsoon zone show. Reservoirs and groundwater follow.

One paradox is worth remembering. A deficit year can still bring flash floods, because the rain that does fall often arrives in short, violent bursts. India's monsoon, even when it disappoints, never stops surprising.

- Ends