Highest temperature in Paris on August 20?

Platform comparison

Market context

On 20 August 2026, the highest temperature recorded at Paris-Le Bourget Airport will determine which temperature bracket resolves YES on this Polymarket contract. The 0% crowd probability reflects current pricing across USDC-denominated conditional tokens on Polygon, where traders are evidently pricing out the upper temperature ranges entirely. Settlement hinges on Weather Underground's Daily Observations table rather than summary figures, a distinction that matters when automated station readings occasionally diverge from rounded reporting.

Historical August temperatures at Le Bourget show considerable year-to-year variation. The station recorded 38.4°C on 7 August 2015 during an exceptional European heatwave, whilst August 2021 peaked at 35.1°C. More typical recent Augusts have seen highs between 26–32°C, with the 30-year August average around 25°C. The current zero-probability pricing suggests the market has anchored to cooler-than-average scenarios or reflects structural illiquidity in upper-range brackets rather than genuine forecasting consensus.

Traders monitoring this contract should track European weather pattern forecasts from mid-August 2026 onwards, particularly Atlantic high-pressure systems that drive continental heat into northern France. The Météo-France seasonal outlook and any issued canicule (heatwave) warnings will signal whether atmospheric conditions favour the higher temperature ranges. Le Bourget's location north of central Paris means it typically records slightly cooler readings than the city centre, a factor worth considering when evaluating whether extreme heat events would push the airport station into previously-priced ranges.

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 Scam?, which mirrors the Polymarket order book directly.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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.

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%.