Highest temperature in Paris on June 26?

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Market context

A severe heatwave is currently gripping western Europe, with Paris recording temperatures near 41°C and red alerts spanning the continent. This extreme weather event frames the underlying reality for the prediction market on 26 June 2026, where the crowd-implied probability of a "YES" outcome sits at 0%. The market resolves based on the highest temperature recorded at Paris-Le Bourget Airport, sourced from Wunderground, making the current atmospheric conditions the primary variable for any programmatically driven trader evaluating conditional orders or copy-trading bots.

Historical data provides a critical benchmark for interpreting this near-zero probability. The hottest June temperature ever recorded in Paris was 37.6°C on 26 June 1947, a specific date that aligns exactly with the settlement window[7]. While recent news confirms temperatures have surpassed 40°C in Paris during this current heatwave, the 1947 record remains the definitive ceiling for June history, suggesting that a breach of this threshold is statistically improbable unless the heatwave intensifies further[1][3].

Traders should monitor daily meteorological updates and official heat alerts as the settlement window closes, as these are the direct catalysts for temperature spikes. The Met Office and Aemet have issued red alerts for northern Spain and parts of the UK, indicating the heatwave's persistence and potential to push Paris temperatures higher[1]. Any automated strategy must depend on real-time Wunderground feeds for the Paris-Le Bourget station, as sudden shifts in wind patterns or cloud cover could alter the daily high within the final hours before the 12:00 UTC settlement deadline.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

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.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket Bot UK, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket Bot UK is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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.

What does it cost to trade on Polymarket Bot UK?

Zero. Polymarket Bot UK routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket Bot UK triggers a quick verification flow that finishes in minutes.