Highest temperature in Paris on July 15?

Platform comparison

Market context

Paris-Le Bourget Airport is set to record its peak daily temperature for 15 July 2026, with the market currently pricing a YES outcome at 0% implied probability. This near-zero valuation suggests the crowd expects the temperature to fall outside the specific range offered, likely betting on a cooler day despite July being Paris’s hottest month. Historically, mid-July in Paris sees average highs of 26°C, though extremes have reached 43°C in 2019, the highest since 1991 [1]. The typical range for daily highs spans 20°C to 43°C, meaning any temperature above 26°C is plausible but not guaranteed [1].

Traders should monitor real-time forecasts from Wunderground, the official resolution source, as cloud cover and wind patterns can suppress peak temperatures significantly. A recent heatwave warning from Météo-France for northern France could act as a catalyst if sustained, though no such alert has been issued for 15 July yet. The settlement window closes at 12:00 UTC on 15 July, meaning the final reading must be captured before that time [1]. With consensus leaning heavily toward a cooler outcome, value may sit in contrarian positions if atmospheric models shift toward higher humidity and reduced cloud shielding, which typically elevate peak temperatures in urban heat islands like Paris.

Sources: 1

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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.

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.

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.