Highest temperature in Paris on June 26?

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Market context

The real-world event driving this market is the peak temperature recorded at Paris-Le Bourget Airport on 26 June 2026, with the crowd currently assigning zero probability to any outcome exceeding 34°C. This near-total dismissal of higher temperatures aligns with historical precedents where June heat in Paris rarely breaches 35°C, though the current 2026 European heatwave has already pushed national averages to record highs of 44.3°C on 23 June [6]. While the national thermal indicator hit 29.8°C on 23 June [4], localised spikes in southwestern France reached 37.8°C [7], suggesting that while extreme heat is present, the specific Paris-Le Bourget station may remain within the lower bracket implied by the 0% probability.

Traders should monitor the immediate forecast for the Paris region as the settlement window closes, specifically watching for any sudden atmospheric shifts that could elevate temperatures beyond the 34°C threshold. The resolution source is Wunderground data for the Paris-Le Bourget station, and any discrepancy between national heat records and local station readings will be critical [6]. Regulatory accessibility remains a key factor: under German GlüStV and US CFTC frameworks, platforms offering "no-KYC up to $1,500" allow traders to access this market without identity verification, provided the bet size stays within the exempt threshold, though this does not constitute legal advice on compliance obligations.

The market's current 0% probability for outcomes above 34°C reflects a conservative reading of June weather patterns, despite the unprecedented heat streak observed in May 2026 [7]. With the settlement window ending at 12:00 UTC on 26 June, the final temperature reading will be definitive, and any deviation from the forecasted range will resolve the market. The high volume of $51.7K indicates significant trader interest, yet the consensus remains firmly on the lower temperature range, suggesting that the heatwave's impact on Paris-Le Bourget may be less severe than the national average [9].

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 PolyGram, 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.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

What does it cost to trade on PolyGram?

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

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

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.