Highest temperature in Paris on July 9?

Platform comparison

Market context

Paris is currently bracing for an intense heatwave, with temperatures on 9 July 2026 expected to peak between 35°C and 38°C, potentially reaching 38°C by afternoon. This real-world event frames the market titled "Highest temperature in Paris on July 9?", where the crowd-implied probability for a YES outcome sits at 0%. On Polymarket, this contract is priced in USDC on the Polygon network, utilising conditional tokens to resolve based on the highest temperature recorded at Paris-Le Bourget Airport Station, sourced from Wunderground. The settlement window closes at 12:00 UTC on 9 July 2026, locking in the resolution once the official data is published.

Historical precedents from this summer’s heat dome provide critical context for interpreting the current 0% probability. In the days leading up to 9 July, Paris recorded highs of 41°C on 7 and 8 July, with overnight lows staying above 28°C, indicating a persistent and dangerous heat pattern [2]. The orange heatwave alert remains active across Île-de-France, with forecasts suggesting temperatures could reach 38°C on Friday, 10 July, following a similar peak on 9 July [1]. These comparable cases suggest that while the market currently prices a specific outcome as unlikely, the broader thermal conditions in Paris are exceptionally severe, with temperatures consistently exceeding 35°C.

Traders should monitor the Meteo France red alert status and any scheduled cooling centre openings, as these indicate the severity of the heat and potential for temperature fluctuations. Recent reports confirm that temperatures may drop slightly after 9 July, but nights will remain warm, with a small chance of storms later in the week offering limited relief [2]. The dependency on Wunderground data for resolution means that any discrepancies in temperature reporting could impact the outcome. With the heatwave expected to persist until the week’s end, the catalysts for this market are tightly linked to official weather advisories and the performance of cooling infrastructure across the region [4].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Paris on July 9? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Polymarket Scam?, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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 Polymarket Scam?. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Polymarket Scam? 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.