Highest temperature in Paris on August 9?

Platform comparison

Market context

Polymarket is pricing the Paris airport temperature contract at **1% YES**, so the market is effectively saying the specific August 9 reading at Paris-Le Bourget is very unlikely to land in the listed winning band. The event is resolved from Weather Underground’s **Daily Observations** table for the Paris-Le Bourget Airport Station, not the site’s day-summary high, and settlement runs through 12:00 UTC, so traders are really exposed to the exact station observation rather than a broader city forecast. On Polymarket, positions are backed by USDC on Polygon and settle through conditional tokens, so the only figure that matters is the final temperature value recorded in that source.

Historically, Paris in August usually sits far below heatwave territory, with typical highs around the mid-20s Celsius in standard climate summaries, but 2026 has already shown that France can swing into exceptional heat, including a national record summer pattern reported by AP and NPR in June. That matters because a 1% price usually reflects a market that expects the forecast to miss the target band unless a late-hot surge develops. Comparable Polymarket weather contracts also tend to resolve tightly around the station data, so a small probability can persist even when the broader city forecast looks warm, because the winning bin depends on one exact maximum.

The main catalysts are the short-range forecast, any last-minute heat advisories, and whether afternoon convective showers cap the airport’s maximum before the settlement window closes. Recent Paris forecasts from local coverage pointed to a warmer 8–9 August period with temperatures near or above 30°C, while Time and Date projected a cloudy, showery Sunday, which would usually pull against an extreme final reading. Traders should watch the timing of any updated station observations on Weather Underground, because a brief spike before or after the midday cutoff can decide the contract.

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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.

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%.