Highest temperature in Paris on July 5?

Platform comparison

Market context

The highest temperature recorded at Paris-Le Bourget Airport on 5 July 2026 will determine the outcome of this weather contract, with the market currently pricing a 44.5% chance that the peak hits exactly 30°C[1]. This probability sits below even odds because the binary structure treats any deviation—whether 29°C, 31°C, or higher—as a NO result, spreading risk across ten alternative temperature buckets[1]. Historical precedents from early July 2026 show a powerful heatwave striking France, with southern regions reaching 38–41°C and Paris potentially experiencing 35–38°C, suggesting the modal forecast could centre near 30°C but with significant volatility[2]. The 2026 European heatwaves have already produced unofficial readings as high as 50°C, indicating that extreme outliers remain possible even if the average peak aligns with current expectations[5].

Traders must monitor the next Météo-France or ECMWF forecast update, as the contract resolves in just 48 hours and is highly sensitive to these model shifts[1]. Recent news from June 2026 confirms a red heat-wave alert issued for 54 French departments, with daytime temperatures soaring to 40°C in numerous areas and persisting through the week[3]. The heatwave is expected to last 7 to 10 days, meaning the peak on 5 July could fall within the upper range of the 35–38°C band forecast for northern regions, challenging the 30°C assumption[2]. On-chain mechanics on Polymarket utilise USDC on the Polygon network, where conditional tokens allow precise exposure to the YES or NO outcome, but thin volume means liquidity could shift rapidly with new data[1]. The momentum composite remains cautiously bullish on YES, with a 1-hour price increase of 3.0% and a trend score of 44.38, reflecting growing confidence in the 30°C target despite the mathematical favour of NO[1].

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 Kalshi UK, 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

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.

Do I need to KYC for this market?

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