Highest temperature in Paris on July 16?

Platform comparison

Market context

Paris-Le Bourget Airport will record its peak temperature for 16 July 2026, with the market betting on which Celsius range captures that day’s high. The settlement hinges on the single highest reading at this station, sourced from Wunderground’s daily history for Bonneuil-en-France.

Historical July data for Paris shows average highs of 27.0°C, though extreme days frequently breach 30°C, with recent summers producing peaks near 35°C [2]. Despite this, the current crowd-implied probability for any specific outcome sits at 0% YES for the market’s binary framing, while Polymarket’s range-based version assigns 44% to 33°C and 35% to 32°C as the frontrunners [1]. This divergence highlights how cross-platform odds can vary significantly: prediction markets often split outcomes into granular ranges, whereas sportsbooks or binary contracts may collapse them into broader yes/no propositions, creating apparent mispricings for traders comparing lines.

Traders should monitor the European Heatwave Watch and Météo-France’s 5-day forecast updates, which typically issue daily at 12:00 UTC and adjust for evolving atmospheric conditions. A sudden shift in the Atlantic ridge or Mediterranean moisture influx could push temperatures above 33°C, altering the implied probabilities in real time. No major weather announcements are scheduled beyond these routine updates, but any deviation from the 27.0°C average toward the 30–35°C extremes would be the primary catalyst for odds movement [2].

Sources: 1 · 2

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Best Prediction Markets, which mirrors the Polymarket order book directly.

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.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

Do I need to KYC for this market?

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