Highest temperature in Paris on June 6?

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Market context

On 6 June 2026, the highest temperature recorded at Paris-Le Bourget Airport will fall into one of several discrete ranges, with traders on Polymarket currently pricing all outcomes at 0% YES across the board. This reflects the market's current inability to settle the contract with confidence rather than genuine uncertainty about whether Paris will experience measurable heat that day. The settlement mechanism depends entirely on Wunderground's historical weather data for that specific station, making the resolution deterministic once the date passes and records are published.

Paris in early June typically experiences mild to warm conditions, with average highs around 20–22°C and occasional days reaching 25°C or above. Historical precedent matters here: June 2022 saw a severe European heatwave with Paris recording 33°C, whilst June 2003 peaked at 28°C during that summer's exceptional heat event. Most June days cluster between 18–24°C, making higher temperature ranges progressively less probable. The 0% pricing likely reflects thin liquidity and the absence of early-season weather models rather than traders genuinely believing no temperature will register.

Traders monitoring this contract should watch European weather forecasts from mid-May onwards, as seasonal patterns and any Atlantic blocking systems will become clearer. The Météo-France outlook and European Centre for Medium-Range Weather Forecasts (ECMWF) ensemble runs typically gain reliability three to four weeks before the target date. Any significant heatwave warnings for France in late May would shift market pricing materially, though conditional token mechanics on Polygon mean positions remain illiquid until closer to settlement.

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 Kalshi 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?

Kalshi 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 Kalshi UK?

Zero. Kalshi 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, Kalshi UK triggers a quick verification flow that finishes in minutes.