Highest temperature in Paris on June 26?

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Market context

The underlying event is the peak daily temperature recorded at Paris-Le Bourget Airport on 26 June 2026, measured in degrees Celsius. This single data point will determine the market resolution, with the current crowd-implied probability of a "YES" outcome sitting at 0%, suggesting traders expect the temperature to fall outside the specified range.

Historical precedents frame this near-zero probability as a reaction to the unprecedented heat streak dominating France in late May and June 2026. On 23 June, France recorded its hottest day ever nationwide, with temperatures hitting 44.3°C in southwestern regions and a national average of 29.8°C, while Paris itself saw unprecedented May heat with peaks of 37.8°C [2][4][6]. Given that the warmest day in Paris for June is statistically 26 June with an average of 23.9°C, the current market pricing likely reflects a specific threshold that even these record-breaking conditions are unlikely to breach, or a misunderstanding of the specific range definition by the crowd [7].

Traders must monitor the immediate trajectory of the European heatwave and any official meteorological announcements scheduled for the next 24 hours, as the settlement window closes at 12:00 UTC on 26 June. The dependency on Wunderground data means any gaps in station reporting or delays in the daily update could impact the final resolution, while the ongoing heatwave suggests temperatures will remain elevated despite the statistical average [3][8]. No regulatory announcements are expected to alter the weather outcome, but the German GlüStV and US CFTC frameworks remain relevant for the platform's operational compliance, particularly regarding the "no-KYC up to $1,500" accessibility tier which allows retail participants to engage without identity verification for this specific weather event [5].

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

Where can I trade this market with the lowest fees?

On Polymarket Tax 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?

Polymarket Tax 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'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, Polymarket Tax UK triggers a quick verification flow that finishes in minutes.