India just got its first exchange-traded weather derivative. NCDEX launched RAINMUMBAI on June 1, 2026 — a SEBI-approved, cash-settled futures contract tracking Mumbai's monsoon rainfall deviation from its 30-year average. Here's everything you need to know.
Launch date
June 1, 2026
Exchange
NCDEX
Regulator
SEBI
LPA baseline
2,206.7 mm
Mumbai Monsoon History — CDR vs LPA
Approx. figures · IMD data
2024
~2,450 mm
+243 mm
above
2023
~2,100 mm
−107 mm
below
2022
~2,600 mm
+393 mm
above
2021
~2,890 mm
+683 mm
above
2020
~2,500 mm
+293 mm
above
LPA (30-yr avg)
2,206.7 mm
0 mm
baseline
CDR = actual rainfall minus 30-year LPA of 2,206.7 mm. RAINMUMBAI settles on this figure at season-end (Sep 30).
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India's ₹18 trillion agriculture sector is almost entirely dependent on the June–September monsoon. A 10% shortfall in rainfall can wipe out 20–30% of farm income across affected districts. Yet until June 2026, there was no regulated financial instrument for Indian businesses to hedge this specific risk.
The RAINMUMBAI contract changes that. It was built jointly by NCDEX and IMD under a June 2025 MoU, giving exchange participants a standardised, SEBI-approved way to take a position on whether Mumbai's monsoon will come in above or below its 30-year average.
For the broader market, this is significant not because of RAINMUMBAI specifically — Mumbai's rainfall matters to construction, logistics, and utilities but not directly to most agricultural producers — but because it establishes the legal, regulatory, and data infrastructure for weather derivatives across India. Rainfall contracts for agricultural districts such as Vidarbha, Marathwada, and the Indo-Gangetic plain are the next logical step.
The contract's underlying index — Cumulative Deviation Rainfall (CDR) — is simple arithmetic: actual monsoon rainfall in Mumbai minus the 30-year Long Period Average of 2,206.7 mm.
If you believe 2026 will be a strong monsoon year (La Niña-influenced, historically wetter), you'd buy the contract expecting CDR to finish positive. If you believe El Niño suppression or early withdrawal risks a below-average season, you'd sell.
The important point is that CDR is not directional in the way most financial futures are. It's a mean-reversion instrument. A CDR of +500 mm (strong monsoon) and a CDR of −400 mm (drought) are both tradeable outcomes, with different participants on each side.
Who takes the other side? Farmers and agri-businesses that benefit from heavy rain (lower irrigation costs, higher yields) are natural sellers of rainfall risk — they already have the upside. Urban logistics and construction companies that lose money in excessive rain are natural buyers. The exchange creates a market between these naturally opposing interests.
One thing that distinguishes RAINMUMBAI from informal weather bets is data quality. IMD (India Meteorological Department) has 150+ years of structured rainfall records, with Mumbai specifically having reliable station data going back to the 1840s.
The 30-year LPA used in the contract (2,206.7 mm) is updated periodically by IMD using the standard WMO climatological normal period. Settlement uses real-time cumulative data from official IMD gauging stations across Mumbai — the same data published in daily IMD bulletins.
This matters for trading: unlike opaque OTC derivatives, every participant has access to the same underlying data in real time. IMD publishes daily updates throughout the monsoon season, so you can track CDR progress from June 1 through September 30 as rainfall accumulates.
Weather derivatives are a new asset class for most Indian traders. The mechanics — cash settlement based on an index, no physical delivery, seasonal expiry — are unfamiliar even to experienced equity investors.
PaperPoly runs monsoon and weather outcome markets with $1,000 in virtual capital. You can trade questions like "Will Mumbai's 2026 monsoon exceed the 30-year LPA?" or "Will June 2026 monthly rainfall exceed 500mm?" in a real-time prediction market environment, track your P&L across the season, and learn the dynamics of weather-linked trading before committing real money on NCDEX.
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Browse all markets →What's coming next
NCDEX has signalled RAINMUMBAI is the first product in a broader rollout. Temperature-based indices and rainfall contracts for key agricultural districts (Vidarbha, Marathwada, UP, Punjab) are described as the logical next phase — backed by the NCDEX–IMD MoU covering real-time data across India. For traders, this means the skills you build now in reading CDR dynamics will apply directly to district-level agricultural contracts as they launch.
RAINMUMBAI is India's first SEBI-approved, exchange-traded weather derivatives contract, launched by NCDEX (National Commodity & Derivatives Exchange) on June 1, 2026. It is a cash-settled futures contract that tracks Mumbai's Cumulative Deviation Rainfall (CDR) — the difference between actual monsoon rainfall and the 30-year Long Period Average of 2,206.7 mm. Settlement is fully automatic, based on official IMD rainfall data.
CDR measures how much Mumbai's actual cumulative monsoon rainfall (June–September) deviates from its 30-year Long Period Average of 2,206.7 mm. If actual rainfall is 2,450 mm, CDR = +243.3 mm. If rainfall is 2,100 mm, CDR = −106.7 mm. Traders take positions on whether the final CDR will be positive (above average) or negative (below average) by season-end.
Any SEBI-registered participant with a commodity derivatives account at a NCDEX-registered broker can trade RAINMUMBAI. The primary target users are farmers hedging crop revenue, construction companies managing weather-related delays, power utilities hedging hydro and demand variability, logistics operators, and banks with agricultural loan portfolios. Retail investors can also participate through standard commodity brokerage accounts.
Yes. NCDEX has indicated that RAINMUMBAI is the first in a planned expansion. Rainfall derivatives for other major agricultural districts and temperature-based indices are described as the 'logical next step.' The MoU with IMD signed in June 2025 covers access to historical and real-time datasets across India, which underpins a much broader rollout.
RAINMUMBAI settles in cash at the end of the monsoon season (September 30), using official cumulative rainfall data published by IMD (India Meteorological Department). There is no physical delivery — the contract pays out based purely on the CDR figure. Settlement is fully automatic with no discretionary input.
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