Highest temperature in Paris on July 6?

Platform comparison

Market context

The underlying event is the peak temperature recorded at Paris-Le Bourget Airport on 6 July 2026, a date currently sitting at zero per cent implied probability for a “yes” outcome in the prediction market, despite traders on Polymarket assigning 54% odds to a 34°C peak and 35% to 33°C[1]. This stark divergence between the zero per cent crowd-implied probability and the active Polymarket pricing suggests either a misalignment in market interpretation or a data lag in the settlement window’s current status.

Historically, Paris has seen July peaks of 34°C to 38°C during recent heatwaves, with the city’s all-time record standing at 42.6°C on 25 July 2019[3]. In the 2026 European heatwaves, temperatures across France reached 44.3°C in Landes, while Paris itself experienced peaks of 37°C during the second heatwave of the year[5][7]. These comparable cases frame the 34°C Polymarket leader as plausible, not anomalous, and challenge the zero per cent probability currently reflected in the settlement market.

Traders should monitor Météo-France’s daily forecasts for warm air influxes from North Africa, which have driven peaks of 40°C in previous years[3]. Recent alerts confirm a powerful heatwave pushing temperatures sharply higher across northern France, with afternoon highs of 36°C to 37°C expected in early July[2]. The timing of this heatwave, combined with dry conditions and minimal rain, creates a high-probability catalyst for temperatures exceeding 33°C on 6 July, making the zero per cent market stance appear increasingly detached from real-world meteorological trends.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Paris on July 6? 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 PolyGram. 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.

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 PolyGram trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.