Highest temperature in Paris on June 23?

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Market context

The real-world event in question is the highest temperature recorded at Paris-Le Bourget Airport on 23 June 2026, with the market currently implying a 0% chance of the temperature exceeding 35°C. Historical data frames this probability against recent extreme heatwaves, such as the unprecedented May 2026 streak where France hit 37.8°C and the forecast for June 2026 showing highs up to 40°C (106°F) [3][6]. While the current frontrunner suggests 36°C is likely at 85%, comparable cases like the 1947 record of 37.6°C being obliterated by a heat dome indicate that temperatures could rise above 40°C, challenging the low implied probability for higher ranges [4].

Traders must monitor announcements from the French weather agency regarding record-high forecasts, as peaks of 40°C were observed on Friday afternoon with temperatures expected to rise further [9]. Dependencies include the progression of the heatwave across Europe from east to west, which is active on 23 June 2026, and the specific data release from Wunderground for the Paris-Le Bourget station [7]. Regulatory accessibility is also a factor; under German GlüStV and US CFTC reach, the "no-KYC up to $1,500" threshold allows immediate participation for this market without identity verification, provided the trade stays within that limit, though this does not constitute legal advice on compliance.

This market remains accessible to users who can navigate the regulatory landscape without formal KYC for smaller stakes, yet the 0% probability for the highest temperature range suggests a significant divergence from recent meteorological trends where 40°C peaks were recorded [9]. The settlement window ending 2026-06-23T12:00:00Z requires precise timing for data verification, and the current crowd-implied probability may shift if the heat dome intensifies as forecasted for Sunday [4]. Facts indicate that while the market leans heavily on 36°C, the potential for record-breaking heat remains a critical catalyst for traders to watch.

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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

Is this market available outside the US?

Polymarket Legal 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.

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 Polymarket Legal UK?

Zero. Polymarket Legal 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, Polymarket Legal UK 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.