Highest temperature in Paris on July 23?

Platform comparison

Market context

Polymarket has this contract marked at **0% YES** for a July 23 Paris high above the lower buckets, so the market is already treating the outcome as fully priced into the lowest outcome range on USDC-settled, Polygon-based conditional tokens. For a trader, that means the live price is not expressing uncertainty about whether Paris gets warm in general, but rather how the exchange has classified the day’s *maximum* temperature at Paris-Le Bourget Airport Station once Wunderground posts the official daily high.

Historically, July in Paris usually produces highs in the mid-20s Celsius, with typical July maxima around 26°C and lows near 16°C, which helps explain why the contract has clustered around the 25°C outcome rather than a hot-weather tail. Recent coverage has also shown that France can swing into extreme heat, with Paris-facing forecasts in late June pointing to 36°C to 40°C possibilities before cooler Atlantic air arrives, so the right comparison for this market is not a generic summer day but whether the station records an exceptional spike on the day in question. That makes the 25°C bucket the practical reference point unless a late-day heat pulse pushes the reading higher.

The main catalysts are straightforward: the day’s forecast evolution, any heatwave warnings from French forecasters, and whether cloud cover, wind shift, or thunderstorm activity alters the afternoon maximum before the settlement window closes at 12:00 UTC. Because the market resolves from the Paris-Le Bourget Airport Station entry on Wunderground, traders should watch the station-specific high rather than citywide headlines, and remember that the on-chain position only resolves when the recorded daily maximum is finalised in the source feed.

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Methodology

This page reviews Highest temperature in Paris on July 23? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Kalshi UK, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Kalshi UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.