Pronóstico: Highest temperature in Paris on June 28?

Platform comparison

Market context

The highest temperature recorded at Paris-Le Bourget Airport on 28 June 2026 will likely fall near 35°C, as the historic European heatwave that peaked at 44.3°C earlier in the week is now easing into milder conditions with a heightened risk of thunderstorms [1][5]. This week defined by extreme heat from Monday through Thursday, with peaks near 40°C, has already pushed France’s national thermal indicator to record levels, making the current 0% YES probability on higher ranges a reflection of the cooling trend beginning Friday [1][4].

Traders should monitor Météo-France’s hourly updates for storm development and the timing of the cooling front, as these factors will directly cap the day’s maximum temperature [1]. Recent reports confirm France recorded its hottest day ever on 23 June, but the expected gradual relief from Friday onward suggests the weekend will be significantly milder, reducing the chance of temperatures exceeding 35°C [1][5]. The on-chain mechanics of Polymarket, using USDC on Polygon and conditional tokens, will settle based on Wunderground’s official reading for Paris-Le Bourget, making real-time weather data the critical catalyst for position adjustments [1].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Pronóstico: Highest temperature in Paris on June 28? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Polymarket Argentina. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Polymarket Argentina 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.