Highest temperature in Paris on August 6?

Platform comparison

Market context

Paris has just eased off from the late-June extreme heat that pushed the city to a June record of 40.9°C, and the immediate setup is now for a cooler August day rather than a repeat spike. Current market pricing has already shifted hard in that direction, with the crowd assigning 0% to the yes side at present, which implies traders see the published temperature bands as overwhelmingly likely to land well below any very high threshold.

The historical frame is straightforward: Paris in August is usually warm but not exceptional, with long-run daytime highs around the low-to-mid 20s Celsius rather than heatwave levels. Recent comparable forecasts for 6 August pointed to a high around 25–26°C under mostly sunny skies, while monthly weather guides put typical August maxima near 23–26°C, which supports why the market has clustered around the mid-20s rather than anything hotter.[2][6][7][11]

The main catalysts to watch are the final Paris forecast updates, any change in cloud cover or thunderstorm risk, and whether the day’s peak arrives early enough to be captured by the station reading used for settlement. The market resolves on the highest temperature recorded at Paris-Le Bourget Airport Station for 6 August, using Wunderground history data, so late-afternoon observations matter most and any revision remains relevant until the first datapoint for the following date is published.[3]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Paris on August 6? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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 Prediction Today. 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%.