Pronóstico: Highest temperature in Paris on June 30?

Platform comparison

Market context

The underlying real-world event is the highest temperature recorded at Paris-Le Bourget Airport on 30 June 2026, a date that currently sits in a market where the crowd-implied probability for a "YES" outcome is 0%. On Polymarket, this contract is priced with USDC on the Polygon network, where conditional tokens reflect a frontrunner outcome of 28°C at 51%, with 27°C trailing at 28%[1]. This pricing diverges sharply from the abstract 0% probability, suggesting the market is actively betting on elevated heat despite the stated baseline.

Historical late-June baselines near 23°C underscore how the current pattern remains elevated despite the easing trend, with resolution hinging on whether the heatwave persists[1]. Recent records show Paris hitting 40.9°C on 24 June, the hottest June temperature ever recorded, while France’s national thermal indicator reached 29.8°C, its highest since 1947[2][8]. These precedents frame the current 51% probability for 28°C as a rational response to an unprecedented heatwave affecting western Europe, where red alerts remain active across France, the UK, and Spain[2].

Traders should monitor the Meteo-France daily forecasts and the continuation of red heat alerts, as these are the primary dependencies for temperature outcomes. Aemet has warned that temperatures in northern Spain could reach 42°C, indicating the heatwave’s intensity may extend into late June[2]. The settlement window ends 2026-06-30T12:00:00Z, so any late announcements regarding heat alerts or forecast adjustments will directly impact the conditional token valuations on-chain. Recent news confirms the heatwave is breaking every historical weather record across France, the UK, and Germany, making this a high-stakes event for on-chain traders[6].

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). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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 itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Polymarket Argentina trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.