Highest temperature in Paris on July 12?

Platform comparison

Market context

Paris is currently experiencing passing clouds and a temperature of 93°F (33.9°C) on this Sunday evening, with the settlement window for the July 12 peak temperature closing in just one hour. The crowd-implied probability of 0% for any specific high-temperature range suggests the market views an extreme heat spike as virtually impossible, yet historical data frames this as a potential value trap. While France’s all-time record of 45.9°C occurred in southern Gallargues-le-Montueux, Paris’s own record stands at 42.6°C on 25 July 2019, a date during a major heatwave that also produced the nation’s previous hottest days in August 2003 [1][3][5]. The current consensus treats a July 12 peak as unlikely, but the 2019 anomaly proves Paris can breach 40°C in mid-summer, making the 0% line potentially underpricing a contrarian angle if a late heat surge materializes before midnight.

Traders must monitor the final hourly updates from Wunderground for the Paris-Le Bourget Airport Station, as the resolution depends entirely on the single highest reading recorded before the 12:00Z cutoff [1]. With conditions currently showing passing clouds and a 15 mph northerly wind, the immediate catalyst is whether cloud cover dissipates to allow solar heating to push temperatures higher in the next hour [2]. Recent reports indicate France is under a red heat-wave alert with temperatures across the country averaging 21.6°C overnight, suggesting a broader thermal context that could elevate local peaks [9][10]. The key dependency is the timing of any cloud break; if skies clear before the settlement, the temperature could climb significantly above the current 33.9°C, challenging the market’s zero-probability stance on higher ranges.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Paris on July 12? 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

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.

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.

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.

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.