Highest temperature in Paris on August 20?

Platform comparison

Market context

The market seeks to pinpoint the highest temperature recorded at Paris-Le Bourget Airport on 20 August 2026, with settlement determined by Weather Underground's Daily Observations table rather than summary figures. The crowd currently assigns zero probability to any outcome, suggesting either extreme uncertainty about temperature ranges or insufficient liquidity to establish meaningful odds. Resolution hinges on precise meteorological data from a specific monitoring station, making this a straightforward factual event rather than a subjective forecast.

August temperatures at Le Bourget historically cluster between 18–28°C, with extremes occasionally reaching 30°C during heat waves. The 2003 European heat wave saw Paris record 40.3°C, though such outliers remain rare; the past two decades show August highs typically ranging 24–27°C. The zero-probability reading suggests traders may be waiting for seasonal forecasts or treating this as a placeholder market pending clearer range definitions. Historical volatility indicates the most likely outcomes sit in the mid-to-high twenties, where conventional summer conditions prevail.

Traders should monitor European weather forecasting updates from Météo-France and longer-range models from mid-August 2026 onwards, as these will clarify whether anomalous heat or cooler Atlantic patterns dominate that week. Any significant heat dome developing across western Europe in early August would shift expectations upward; conversely, unsettled Atlantic systems could suppress temperatures. The resolution methodology—specifically reliance on Daily Observations rather than day-high summaries—matters for edge-hunting traders familiar with Weather Underground's data reporting quirks, where intraday spikes sometimes appear in one table but not the other.

Methodology

This page reviews Highest temperature in Paris on August 20? 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 Who Will Win, 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.

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 Who Will Win. 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%.