Highest temperature in Paris on June 26?

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Market context

The underlying real-world event is the highest temperature recorded at Paris-Le Bourget Airport on 26 June 2026, measured in degrees Celsius. On Polymarket, this contract currently prices the outcome of 37°C at 100% certainty, with the USDC pool on Polygon reflecting $60,000+ in total volume across conditional tokens. The market has effectively dismissed any chance of temperatures below 35°C, assigning a 0% probability to that range, while the adjacent 36°C outcome sits at a negligible 0.2¢.

Historical June weather in Paris typically sees highs between 20°C and 24°C, with mild conditions and frequent cloud cover, as noted in early-summer forecasts from 2026[3]. However, a recent extreme heatwave across western Europe shattered records, pushing Paris to nearly 41°C and triggering red heat alerts[4]. France’s national thermal indicator hit 29.8°C, its highest since 1947, while Spain and the UK also recorded unprecedented June temperatures[4][6]. This outlier event frames the current 100% pricing of 37°C, suggesting traders are betting on a repeat of extreme heat rather than typical mild weather.

Traders should monitor official Meteo-France heat alerts and daily temperature bulletins for the Île-de-France region, as these directly influence settlement via Wunderground data. The settlement window ends at 12:00 UTC on 26 June, so any late-morning temperature spikes or red alert escalations could confirm the 37°C outcome. Recent news from the BBC confirms that red heat alerts remain active in northern Spain with temperatures potentially reaching 42°C, indicating the heatwave’s persistence across the continent[4]. No new announcements are expected before the deadline, but real-time Wunderground updates will be the definitive resolution source.

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

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket Scam?, 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.

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?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket Scam? 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.