India Weather Update: Delayed Monsoon Withdrawal and Rainfall Deficits in September 2026

As of late September 2026, India's weather patterns have been defined by a delayed monsoon retreat and significant rainfall imbalances. While typical seasonal transitions usually occur earlier, the Indian Meteorological Department (IMD) observed conditions that pushed the monsoon's withdrawal beyond the usual dates, impacting both the environment and agriculture across several states.

Atmospheric Drivers of the Delayed Retreat

The withdrawal of the southwest monsoon is not determined solely by the cessation of rain, but by a decrease in lower-atmospheric cyclonic activity and moisture. In September 2026, monsoonal winds effectively blocked the dry winds typically arriving from the west, delaying the retreat process. Punjabi Jagran reported on September 13, 2026, that a low-pressure area near Madhya Pradesh intensified rainfall in Gujarat, Rajasthan, and Central India, preventing the necessary conditions for an early withdrawal.

Further extending this activity, a weather system was projected to form in the Bay of Bengal around September 20, 2026. Consequently, while the monsoon began retreating from western Rajasthan around September 19, 2026, it marked a delay compared to the previous year, when the process started on September 14.

Regional Weather Impact and Alerts

During the mid-September period, the IMD issued alerts for several regions. According to ABP Sanjha, forecasts issued on September 16, 2026, predicted heavy rain and thunderstorms across 18 states, including Punjab, Haryana, Delhi-NCR, Uttar Pradesh, Bihar, Jharkhand, Odisha, and West Bengal.

Key Weather Observations (September 2026)

• Wind Speeds: Forecasts indicated wind speeds of 40 to 60 kmph in affected regions.
• North India: Light to moderate rain was expected across Himachal Pradesh, Uttarakhand, Uttar Pradesh, and Bihar, with Uttarakhand facing specific heavy rain warnings.
• West & Central India: Heavy rain was noted for Madhya Pradesh, Rajasthan, and eastern Gujarat, though Saurashtra and Kutch continued to face significant rainfall shortages.
• Maritime Warnings: Fishermen were advised to remain cautious in the Arabian Sea and the Bay of Bengal due to deteriorating sea conditions.

Rainfall Deficits and Agricultural Significance

The delayed retreat became a critical factor for Indian agriculture due to a widespread rainfall deficit. As of mid-September 2026, total rainfall across India was reported to be approximately 15% below normal. The distribution was highly uneven, with some states experiencing deficits as high as 40-45%.

Because of these deficits, the late-September rains—driven by the delayed ਮੌਸਮ patterns—became essential for maintaining soil moisture and supporting crop health before the onset of the winter season. However, the IMD noted that this rainfall remained fragmented, meaning some areas within the same state experienced heavy downpours while others remained dry.