Highest temperature in Paris on June 26?

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Market context

A severe heatwave is currently battering western Europe, with France recording its hottest day ever and temperatures soaring to 41°C in Paris, prompting red heat alerts across the region. This extreme event frames the current 0% crowd-implied probability for the June 26 Paris temperature contract, as the market appears to have priced in a rapid decline despite the ongoing intensity of the current surge.

Historical data reveals that June 26, 1947, marked the hottest June temperature in Paris history at 37.6°C, a benchmark recently shattered by current readings exceeding 40°C. While the current heatwave is expected to shift toward Berlin and ease by Sunday, the sheer magnitude of the present anomaly suggests that a return to sub-30°C conditions by the settlement window on June 26 is statistically improbable, creating a stark divergence between the prediction market’s zero probability and the analyst consensus on sustained high temperatures.

Traders should monitor the latest forecasts from the French weather agency, Meteo France, regarding the timing of the heatwave’s retreat, as recent reports indicate a potential decline only by next week rather than the weekend. The settlement depends entirely on the peak temperature recorded at Paris-Le Bourget Airport, and given the current trajectory of record-breaking highs, any announcement suggesting a delayed cooldown could significantly alter the odds, making the current 0% line a notable outlier compared to cross-platform sportsbook valuations that acknowledge the persistence of extreme heat.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Paris on June 26? on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

On Best Prediction Markets, 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.

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'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 Best Prediction Markets?

Zero. Best Prediction Markets 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.