Highest temperature in Paris on August 20?

Platform comparison

Market context

The market is pricing the highest temperature at Paris-Le Bourget Airport on 20 August 2026 at 0% probability across all temperature ranges, suggesting the crowd expects no outcome to occur—an impossible resolution state that signals either extreme uncertainty or a technical misunderstanding of the market structure. August temperatures in Paris typically peak between 24–27°C, with historical records showing the city rarely exceeds 30°C even during heat waves, making mid-to-high 20s the consensus zone for any given day in that month.

Paris experienced a 40.3°C maximum in June 2022 during an exceptional European heat event, though August tends to run cooler than early summer. The 20-year average high for mid-August sits around 25°C, with roughly one in five years seeing temperatures above 28°C. The 0% crowd probability reflects either a settlement mechanism concern or genuine indifference to the outcome rather than a substantive weather forecast; traders should verify whether the market's resolution criteria—specifically the reliance on Weather Underground's Daily Observations table rather than summary figures—creates ambiguity that's depressing participation.

Monitoring European weather patterns through early August 2026 will be essential, particularly any Atlantic ridge positioning or heat dome development that could push continental temperatures upward. The Météo-France forecast issued in the week before 20 August will provide the most actionable signal; traders should also cross-reference Le Bourget's historical daily maximums against the specific temperature bands offered, as airport microclimates occasionally diverge from city-centre readings.

Methodology

We track Highest temperature in Paris on August 20? 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 Who Will Win 2026. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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 Who Will Win 2026 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.