Introduction
The Southwest Monsoon
is India’s lifeline, bringing relief from summer heat and sustaining
agriculture. Knowing where and when it first arrives is crucial for farmers,
travelers, and planners.
First Monsoon Arrival
- Overall (India):
Andaman & Nicobar Islands – around May 22 every year.
- Mainland India:
Kerala (Thiruvananthapuram) – around June 1.
In 2026, IMD
confirmed monsoon onset in the Andaman & Nicobar Islands on May 18,
earlier than usual, making Kerala’s arrival expected between May 24–26.
Highlights
- Kerala First on Mainland:
Due to its southwest location and Arabian Sea winds.
- Western Ghats Effect:
Mountains trap moisture, ensuring heavy rainfall.
- Monsoon Spread:
Covers entire India by July 15.
- Agricultural Importance:
Accounts for 70% of India’s annual rainfall.
Monsoon Timeline (Normal Dates)
| City / State | Arrival Date |
|---|---|
| Andaman & Nicobar Islands | May 22 |
| Kerala (Thiruvananthapuram) | June 1 |
| Goa & Coastal Karnataka | June 5–10 |
| Mumbai, Maharashtra | June 11 |
| Kolkata, West Bengal | June 10–15 |
| Delhi | June 27–July 1 |
| Rajasthan (complete) | July 15 |
Conclusion
The Andaman &
Nicobar Islands are the first to welcome the monsoon, followed by Kerala
on the mainland. By mid‑July, the rains spread across the entire country,
replenishing rivers, supporting agriculture, and bringing relief from the
scorching summer.