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When heat reaches the bank: how a heatwave travels from a day’s wages to a lender’s books.

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It starts with a hotter day, and a smaller wage. Heat cuts working hours, and incomes fall first for vendors, farmers and daily-wage workers.

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Then the instalment waits. Repayments slow, and field visits stop in the heat.

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In 2025, heatwaves cut what lenders collected in the June quarter.

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The strain moves up. Lenders face a cash crunch, and costlier funding.

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About 60% of India’s ₹3.81 trillion microfinance portfolio is in farming and allied work.

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Regulators are moving. The Reserve Bank of India now treats heatwaves as a prudential risk.

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But disclosing heat exposure is still voluntary for some.

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What could help? Three ways to pay for protection, used together.

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Parametric insurance, which pays out automatically when heat crosses a set line.

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Blended finance, where patient capital takes the early risk.

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And green and resilience bonds, for long-lasting public infrastructure.

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And what makes them work?

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Shared heat-risk data.

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Lending tied to measurable heat outcomes.

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And city platforms that pool many small projects.

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From financing vulnerability, to financing resilience.

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Based on a commentary by Namita Vikas, in Mongabay India.