Highest temperature in Paris on June 26?

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Market context

The underlying event is the daily peak temperature at Paris-Le Bourget Airport on 26 June 2026, a critical metric for the prediction market where the crowd currently assigns zero probability to a “YES” outcome for any range above 36°C. This 0% figure appears starkly misaligned with recent market data, where the frontrunner is actually 36°C at 68% probability, followed by 37°C at 28%, suggesting the crowd-implied probability cited may refer to a specific high threshold rather than the entire market’s consensus[1].

Historically, Paris in June sees daily highs rising from 69°F to 74°F, rarely exceeding 84°F (approximately 29°C), yet extreme heatwaves have shattered these norms; France recently recorded its hottest day ever with 44.3°C in Landes, and Paris itself hit a record 42.6°C on 25 July in past years, while 2026 has seen a red heat alert across 54 departments indicating persistent, dangerous temperatures[2][3][4]. The 0% crowd-implied probability likely ignores these precedents, failing to account for how recent record-breaking heat in western Europe has redefined June temperature ceilings in the region.

Traders must watch Meteo France’s daily red alert updates and Wunderground’s live hourly data for Paris-Le Bourget, as the resolution source explicitly relies on this platform’s recorded peak for the day[4]. Any sudden shift in wind patterns from the Atlantic or a surge in shortwave solar energy could push temperatures beyond 36°C, especially given the current heatwave’s persistence; a recent NBC News report confirms that high temperatures will continue around the clock across 54 departments, making a 36°C+ outcome highly plausible despite the crowd’s initial dismissal[3].

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

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 Champions League Prediction, 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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Champions League Prediction triggers a quick verification flow that finishes in 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.