Highest temperature in Paris on August 15?

Platform comparison

Market context

Paris will experience some temperature on 15 August 2026, and this market captures whether that daily high will fall into a specific range. The resolution hinges on Weather Underground's Daily Observations table at Paris-Le Bourget Airport Station, not the summary Day High & Low figure—a distinction that matters for automated resolution and API-based monitoring. Traders building conditional order logic or bot-driven strategies should note this source hierarchy, as discrepancies between the two datasets have occurred historically and will determine settlement.

August temperatures in Paris cluster around 24–26°C as daily highs, with extremes reaching 30°C or above during heat waves. The 1% crowd probability suggests the market is pricing a notably elevated outcome. Historical data from Météo-France shows that August heat waves in the Île-de-France region occur irregularly; the summer of 2022 saw sustained temperatures above 30°C, whilst 2023 and 2024 remained closer to seasonal norms. A trader evaluating this market programmatically would benefit from cross-referencing European heat forecasts released in early August 2026 and monitoring Atlantic pressure patterns, which drive warm air masses into northern France.

Catalysts to track include mid-range weather model consensus (typically stabilising 10–14 days before the date) and any heat-dome formation signalled by Météo-France or ECMWF forecasts. The settlement window closes at midday UTC on 15 August, so real-time temperature feeds from Weather Underground become critical in the final hours. Traders automating position closure should build in buffer time before the 12:00 deadline to account for data latency.

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 Review UK, 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 Review UK. 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%.