Break in Monsoon: Why Indian Rainfall Pauses Mid-Season
A break in monsoon is a spell of several days during the June–September season when rainfall over most of India suddenly weakens or stops, even though the monsoon has not withdrawn. It is caused by the northward shift of the monsoon trough towards the Himalayan foothills, and is closely linked to El Nino, the Madden-Julian Oscillation and the frequency of Bay of Bengal low-pressure systems. For UPSC, breaks explain a paradox that examiners love: why a season of normal total rainfall can still produce drought in the fields.
📌 Revision Pointers
Definition — A dry spell of three or more days within the southwest monsoon season, without withdrawal of the monsoon.
Monsoon Trough Shift — Break occurs when the trough (the Indian arm of the ITCZ) moves north to the Himalayan foothills, bringing heavy rain to the sub-Himalayan belt and North-East but dry conditions to the plains.
Jet Stream Link — Weakening of the Tropical Easterly Jet and the southward return of the Subtropical Westerly Jet reduce the upper-air divergence needed for deep convection.
ENSO Control — El Nino shifts the descending arm of the Walker Circulation over India, increasing the number and length of break spells.
MJO Phases — MJO phases 4 to 6 over the Maritime Continent and West Pacific suppress Indian convection; phases 2 to 3 revive it.
PYQ Connect — Prelims has repeatedly tested ITCZ, jet streams and the El Nino-monsoon link (2015, 2020 on ENSO and monsoon), while GS-1 Mains 2017 asked about the spatial variation of the southwest monsoon and 2022 on monsoon rainfall variability and its impact on agriculture.
Core Concept
The southwest monsoon is not a continuous rain machine; it advances in pulses. Rain-bearing activity is organised around the monsoon trough, an elongated low-pressure belt that is the Indian arm of the Inter-Tropical Convergence Zone, normally lying from north-west India to the head of the Bay of Bengal. When this trough drifts northward and settles near the foothills of the Himalayas, the plains lose their zone of convergence. Rainfall collapses over central and peninsular India, while the sub-Himalayan belt, Uttarakhand and the North-East receive very heavy rain and floods. This dry spell is called a break in monsoon. Breaks are sustained when the Tropical Easterly Jet weakens, when the Subtropical Westerly Jet returns south of the Tibetan Plateau, and when few low-pressure systems form over the Bay of Bengal. Two or three short breaks in a season are normal and even useful, since they permit farm operations and prevent waterlogging. Long breaks in July and August, when kharif crops are at their most water-sensitive stage, are agriculturally devastating.
Key Points
Breaks are a normal feature of the monsoon rhythm; their timing and duration, not their existence, decide crop outcomes.
During a break, rainfall shifts to the Himalayan foothills and the North-East, so national totals may look adequate while central India stays dry.
El Nino and unfavourable MJO phases lengthen breaks, whereas active Bay of Bengal depressions end them.
Breaks explain the difference between rainfall quantity and rainfall distribution, the real determinant of agricultural performance.
Memory Trick
Remember TREK — Trough moves north, Rain shifts to the foothills, El Nino extends it, Kharif suffers. When the monsoon trough goes trekking to the Himalayas, the plains go thirsty.
Current Relevance (2024-2026)
The 2026 southwest monsoon set in over Kerala on 4 June, later than both its normal date and the IMD forecast, and the season began under an emerging El Nino, with IMD projecting rainfall near 90 per cent of the Long Period Average. El Nino years typically bring longer and more frequent break spells, and 2026 has therefore been watched closely for mid-season dry phases affecting kharif sowing. This connects directly to Mission Mausam, the Union Government initiative to strengthen observation networks and extended-range forecasting, whose central practical purpose is to give farmers advance warning of exactly such break periods.
💭 Conclusion
UPSC has consistently tested the monsoon in both papers — Prelims through the mechanism route of ITCZ, jet streams, El Nino and the Indian Ocean Dipole, and Mains GS-1 through questions on the spatial and temporal variability of monsoon rainfall and its consequences for Indian agriculture. With an El Nino-influenced 2026 season, uneven rainfall distribution and the rollout of Mission Mausam all in the news, the break phenomenon sits precisely at the meeting point of static geography and current affairs. Master this topic — it is high-probability for UPSC 2026.