Highest temperature in Paris on August 14?

Platform comparison

Market context

On 14 August 2026, the highest temperature recorded at Paris-Le Bourget Airport will fall into one of several defined ranges. The market currently prices all YES outcomes at 0%, meaning traders are collectively assigning negligible probability to any specific temperature bracket. This contract settles against Weather Underground's Daily Observations table rather than the Day High & Low summary, a distinction that matters when station readings diverge—a common occurrence at major European airports where multiple sensors operate simultaneously.

Historical August temperatures at Le Bourget show a median high around 25–26°C, with extremes ranging from 18°C in cooler years to 37°C during heat waves. The 2003 European heat wave saw Paris record 40°C, though Le Bourget's readings typically run 1–2°C cooler than central Paris. Recent summers have produced scattered days exceeding 30°C, but sustained heat waves remain episodic. The current 0% pricing suggests the market has not yet crystallised around any particular range, possibly because the event lies two years forward and atmospheric patterns remain too uncertain for meaningful calibration.

Traders should monitor European summer weather patterns from late July onwards, particularly Atlantic blocking systems that drive continental heat into northern France. The Météo-France seasonal outlook, typically released in June 2026, will provide the first institutional guidance on whether August conditions favour above-normal or below-normal temperatures. Any significant heat dome forecast in early August would likely shift conditional token prices on higher-temperature ranges, though Le Bourget's coastal-influenced microclimate means it rarely reaches the extremes seen inland.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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

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.

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%.