Highest temperature in Paris on August 9?

Platform comparison

Market context

Paris’s **highest recorded temperature on 9 August** will determine the winning outcome, and the market settles on the **Daily Observations** table for the Paris-Le Bourget Airport Station rather than the broader Day High & Low summary. In prediction markets, a **YES share** pays out if the specific outcome happens; a **NO share** pays out if it does not, so the current 1% YES price implies traders see only a small chance of a temperature landing in the selected winning range.

The low price also fits the seasonal baseline. Paris normally sits in the mid-20s Celsius in August, with typical highs around 25°C, although recent summers have produced much sharper spikes and heatwaves across France. Reuters reported in June that Météo-France was warning of temperatures reaching record highs during a separate heat event, underlining how quickly French summer weather can move from ordinary to exceptional.[18] That said, the market is not asking whether Paris will feel hot in a general sense; it is asking which exact Celsius band contains the station’s single highest observation for the day.

For traders, the key catalysts are the published forecast updates, any heat advisories or shifting pressure systems affecting north-east France, and the actual hourly readings that feed Weather Underground’s Daily Observations table. Recent Paris forecasts pointed to a warm but not extreme day, with highs around 30°C and a chance of showers later, which would keep the result well below the very hottest bands if verified.[10][13] Because settlement depends on the station record rather than the citywide headline forecast, late-morning temperature peaks and any data-handling discrepancy on Weather Underground are the details to watch most closely.

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Methodology

This page reviews Highest temperature in Paris on August 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 Prediction Market UK, which mirrors the Polymarket order book at 0% fees.

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.

UK Frequently Asked Questions

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.

Is Polymarket legal in the UK?

Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.

Do I pay tax on prediction market profits in the UK?

UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.

How do I deposit on Polymarket from the UK?

UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.