Highest temperature in Paris on August 6?

Platform comparison

Market context

Polymarket is pricing the Paris Le Bourget airport high for 6 August as a live USDC market on Polygon, with conditional tokens settling against the day’s maximum temperature recorded on Wunderground; the current crowd view is still not assigning any meaningful probability to a breakout extreme, which leaves the contract looking anchored around the upper-20s Celsius outcomes rather than a heat-wave spike. Because settlement depends on the single highest reading at Paris-Le Bourget before the 12:00 UTC cut-off, traders are effectively pricing the meteorology, not the city’s tourist weather, and any late-day warmth after the window closes is irrelevant to resolution.[3]

The main reference point is Paris’s summer climatology: late August normals are usually around the low-to-mid 20s °C, and several forecast services have been pointing to a modestly warm, not exceptional, day in the capital. AccuWeather’s August outlook shows Paris running near the low 20s to around 27°C, while Paris forecast pages this week have suggested highs close to 25-26°C, which is consistent with why the market has sat far from the very hot tails.[1][6][7] The 2026 French heat episodes earlier in the summer matter as a reminder that Paris can overshoot averages quickly, but they were exceptional events rather than a baseline for every August afternoon.[11][14][17]

For a trader, the key catalysts are the final-hour forecast updates, the timing of any afternoon cloud cover or showers, and whether the airport station itself briefly touches a higher reading than central Paris forecasts imply. The market description notes that revisions to temperatures inside the window can still count until the first datapoint for the next date is published on Wunderground, so the relevant watchlist is the station feed rather than headline city forecasts.[3] That means the last public model runs, local convection, and the exact timing of the day’s peak heat are the practical drivers of price into settlement.

Sources: 1 · 2 · 3 · 4 · 5

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 Kalshi UK, which mirrors the Polymarket order book directly.

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 Kalshi UK. 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%.