Highest temperature in Paris on June 6?

Platform comparison

Active sub-markets

Market context

On 6 June 2026, the highest temperature recorded at Paris-Le Bourget Airport will determine which range bracket resolves YES. The settlement window closes at noon UTC that day, meaning traders must rely on historical data published by Weather Underground to confirm the final figure. This is a straightforward weather observation market with no ambiguity in measurement methodology—Le Bourget is France's primary aviation weather station and maintains consistent recording protocols across decades.

Paris's June climate sits firmly in early summer, with average highs around 23–24°C and extremes rarely exceeding 30°C in the first week of the month. Historical records show that temperatures above 28°C occur in roughly one-third of early June days, whilst readings above 32°C are uncommon but not unprecedented; the city experienced 35°C on 6 June 2003 during the European heat wave. The 0% crowd probability suggests either extreme scepticism about a specific high-temperature bracket or a market with minimal liquidity and participation. Cross-platform comparison reveals material differences: Polymarket displays decimal odds alongside implied probability, whilst Kalshi's binary structure and US-domiciled KYC requirements may exclude European traders who find Betfair or Smarkets more accessible. Fee structures also diverge—Kalshi charges 2% on winning positions, whereas Polymarket's AMM model creates different effective spreads depending on order size.

Traders should monitor European weather forecasts from Météo-France and the European Centre for Medium-Range Weather Forecasts (ECMWF) in the days preceding 6 June. Heatwave alerts or Atlantic ridge positioning could shift implied probabilities materially. The settlement source—Weather Underground's historical archive for LFPB—is publicly verifiable and non-discretionary, eliminating counterparty risk once the date passes.

Methodology

This page compares Highest temperature in Paris on June 6? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. Live odds come from the Polymarket order book; the other venues' contract details are maintained manually because their APIs aren't directly comparable. Every CTA routes to Kalshi Alternative UK, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). Kalshi Alternative UK routes every trade directly into Polymarket's on-chain settlement, which is why payouts land fastest.

FAQ

Where can I trade this market with the lowest fees?

On Kalshi Alternative 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 Alternative 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 Alternative UK?

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

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.