India Monsoon Weather Update June 4, 2026: From Lakshadweep to Southeast Bay of Bengal, Where has Monsoon Already Arrived, Where it will Hit Next | Check Forecast

The Southwest Monsoon officially arrived in India on June 4, 2026, making landfall over the Kerala coast. This onset marks a slight delay compared to the typical June 1 arrival date and misses the India Meteorological Department’s (IMD) earlier forecast windows of May 26 and May 27. 

According to the India Meteorological Department (IMD), the Southwest Monsoon has already covered extensive areas of the Arabian Sea and the Bay of Bengal, and conditions remain favourable for its further advance into additional regions over the next two to three days.

India Monsoon Weather Update June 4, 2026:  Places Where Monsoon Has Already Entered

According to the India Meteorological Department (IMD), monsoon has entered and fully or partially covered the following areas:

·       Kerala (entire state)

·       Mahe

·       Lakshadweep Islands

·       Andaman and Nicobar Islands (entered early on May 16, 2026)

·       Southwest & Southeast Arabian Sea (parts)

·       Bay of Bengal (large sections including south, west-central, east-central, and northeast parts)

·       Karnataka (fringe entry into southern parts)

·       Tamil Nadu (fringe entry into southern parts and Comorin area)

India Monsoon Weather Update June 4, 2026: Places It is About to Enter

Weather conditions remain highly favourable for the monsoon to advance further over the next 2 to 3 days into:

·       Entire Goa

·       Parts of Maharashtra

·       Remaining parts of Tamil Nadu

·       Parts of Andhra Pradesh

India Monsoon Weather Update June 4, 2026: Why Does Monsoon Enter Mainland India via Kerala?

The southwest monsoon enters mainland India via Kerala primarily due to the state’s geographic positioning and the rotational physics of the Earth.

1. Direct Path of the Trade Winds

During summer, the Indian mainland heats up, creating a massive low-pressure zone. This draws in moisture-heavy trade winds from the high-pressure zone over the southern Indian Ocean. As these winds cross the equator, the Earth’s rotation bends them from left to right (a phenomenon known as the Coriolis Effect). This turn directs the winds to blow from the southwest straight toward the southern tip of the Indian peninsula.

2. Latitude and Geographic Projection

Kerala sits at the southwestern base of the Indian subcontinent. Because it juts out into the Arabian Sea at a low latitude (closer to the equator than the rest of mainland India), it physically blocks the path of these advancing southwest winds first.

3. The Western Ghats Wall

Kerala is backed by the continuous, towering mountain range of the Western Ghats. When the moisture-laden southwest winds hit these mountains, they are forced to rise abruptly. As the air rises, it cools, condenses, and dumps massive amounts of rainfall. This geographical feature creates the dramatic, official “onset” weather pattern that defines the arrival of the monsoon.

4. Splitting of the Wind Current

Just before hitting the mainland, the massive monsoon current splits into two branches around the southern tip of India:

The Arabian Sea Branch: Hits Kerala directly, causing the mainland onset.

The Bay of Bengal Branch: Moves parallel to the eastern coast, hitting the Andaman Islands first before heading toward Northeast India.