Pronóstico: Highest temperature in Paris on July 3?

Platform comparison

Market context

Paris is bracing for a powerful heatwave on 3 July 2026, with temperatures sharply rising across northern France and expected highs between 36°C and 38°C, possibly reaching 40°C in the Paris region[3]. The market currently prices the 28°C outcome at 78%, despite the underlying event suggesting significantly warmer conditions, creating a stark divergence between on-chain sentiment and meteorological reality[1]. This mispricing reflects how conditional tokens on Polygon, settled in USDC, can lag behind real-time weather updates when traders rely on historical averages rather than live forecasts.

Historical precedents frame this anomaly: in June 2026, Paris recorded nearly 41°C during a record-breaking heatwave that triggered red alerts across western Europe, with France’s national thermal indicator hitting 29.8°C—the hottest day since 1947[4]. Such extremes are not isolated; the 2026 European heatwaves have already produced unofficial readings of 50°C in parts of the continent, confirming that July temperatures in Paris routinely exceed 35°C during intense summer spells[9]. The current 0% probability assigned to higher ranges contradicts these patterns, suggesting traders may be underestimating the frequency of extreme heat events in recent years.

Traders should monitor Météo France’s daily bulletins and Wunderground’s real-time data for the Paris-Le Bourget Airport Station, as the settlement relies exclusively on this source[2]. A recent forecast from Le Monde confirms the third heatwave of 2026 is building, with dry conditions and intense sunshine limiting overnight cooling, pushing daytime peaks toward 37°C by midday[3]. The key catalyst is the confirmation of sustained high UV levels and minimal rainfall, which will determine whether the 28°C frontrunner holds or collapses as temperatures approach the 36–38°C range forecasted for the weekend[3].

Sources: 1 · 2 · 3 · 4 · 5

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 Polymarket Qué Es, which mirrors the Polymarket order book directly.

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 Qué Es. 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.

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.

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.