For much of June, India's monsoon map presented an unexpected sight: Rajasthan, a state largely covered by the Thar Desert, experienced above-normal rainfall, while Maharashtra, usually a beneficiary of the Arabian Sea monsoon branch, grappled with a significant rain deficit. This reversal has prompted questions among farmers, water managers, and weather experts across the country.
Normal Monsoon vs. This Year's Anomaly
Typically, June sees moisture-laden winds from the Arabian Sea rapidly moving up India's west coast, bringing widespread rainfall to states like Kerala, Karnataka, Goa, and Maharashtra before moving inland. Rajasthan usually awaits widespread monsoon rains until late June or early July.
However, the 2026 monsoon season has deviated from this pattern. Rainfall has been concentrated over parts of northwest India, while central Indian regions, including Maharashtra, Gujarat, and Madhya Pradesh, have remained significantly drier. Mumbai, for instance, is experiencing one of its driest starts to the monsoon in years, raising concerns about reservoir levels.
Role of Western Disturbances
Meteorologists point to an unusual influence: Western Disturbances. These weather systems originate over the Mediterranean and typically bring winter rain and snow to North India. This year, however, they have continued to affect weather patterns well into June. As these disturbances moved across northern India, they interacted with moisture from the Arabian Sea, triggering thunderstorms across Rajasthan, Punjab, and Haryana. This effectively diverted atmospheric moisture northward, away from its usual central Indian path, resulting in frequent thunderstorm activity and above-normal rainfall in many Rajasthan districts.
Why Maharashtra is Missing Out
Simultaneously, the Arabian Sea branch of the monsoon has remained unexpectedly weak. The southwest monsoon relies on strong cross-equatorial winds to transport moisture from the southern Indian Ocean into the Arabian Sea and towards India's west coast, often reinforced by the powerful Somali Jet. This year, this moisture conveyor belt has struggled to strengthen. Satellite imagery throughout June showed a lack of sustained deep cloud formation along large sections of the west coast, indicating an insufficient moisture supply. Consequently, widespread organized rainfall over Maharashtra has been largely absent.
Impact of the Monsoon Trough
Another critical factor is the position of the monsoon trough, an elongated low-pressure zone over northern India. During active monsoon phases, this trough usually lies closer to central India, distributing rainfall across Maharashtra, Madhya Pradesh, and Chhattisgarh. However, this year, under the influence of western disturbances, the trough has frequently shifted northward. When the trough moves north, rainfall follows, favoring the Himalayan foothills, Punjab, Haryana, and Rajasthan, while leaving central India with suppressed thunderstorm activity and fewer rain-bearing systems.
Dry Air's Contribution
The rainfall deficit in central India has been further exacerbated by repeated intrusions of dry air from the northwest. Meteorologists observed large pockets of dry mid-level air moving into the monsoon region. Such dry air inhibits thunderstorm growth and prevents cloud systems from developing into widespread rain-producing systems, reducing rainfall efficiency even when surface moisture is available. This has resulted in extensive cloud-free zones over Maharashtra, Gujarat, and Madhya Pradesh, while active weather systems remained concentrated farther north.
Broader Implications
The implications of this unusual monsoon pattern extend beyond weather forecasts. Maharashtra is a key agricultural state, producing crops like sugarcane, cotton, and soybeans. Prolonged rainfall deficits can disrupt sowing operations, reduce soil moisture, and increase reliance on irrigation. Urban centers like Mumbai are already implementing water management measures due to concerns over water security.
Conversely, excess early-season rainfall in Rajasthan carries its own risks, including increased flood threats in areas with limited drainage infrastructure and fragile desert ecosystems.
A Glimpse into Future Monsoons?
While climate scientists caution against attributing a single monsoon season directly to climate change, research suggests increasingly erratic rainfall patterns across India. This includes longer dry spells punctuated by intense bursts of rain, greater variability in traditional monsoon regions, and more frequent extreme rainfall events over northwest India.
The unusual scenario of a wetter Rajasthan and a drier Maharashtra may therefore be more than just a seasonal anomaly. It could offer another insight into the growing unpredictability of India's monsoon patterns, with significant long-term consequences for agriculture, water resources, and the millions of people who depend on them.