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. Despite the current crowd-implied probability of 0% for a "YES" outcome on the binary contract, the Polymarket market for the specific temperature range is pricing "36°C" as the leading outcome at 68%, with "37°C" trailing at 28%[1]. This on-chain pricing, settled in USDC on the Polygon network via conditional tokens, suggests traders are betting on a significant heat spike rather than the mild conditions typical of early summer.

Historically, June in Paris is mild, with high temperatures usually hovering between 20°C and 24°C, as seen in forecasts for early June 2026 which predicted highs around 22°C[2]. However, recent extremes frame a different narrative; a severe heatwave recently pushed temperatures in Paris to nearly 41°C, marking France's hottest day ever and triggering red heat alerts across western Europe[3]. This precedent of record-breaking heat indicates that the current 0% probability for the binary "YES" may be mispricing the risk of a sudden, intense temperature surge similar to the recent anomaly.

Traders should monitor Meteo France's daily heatwave bulletins and the European Heatwatch network for evolving red alert statuses, as these are the primary catalysts for temperature spikes[5]. The settlement source, Wunderground data for Paris-Le Bourget, will be the definitive record, but on-the-ground announcements of heat alerts often precede the peak readings. With the settlement window closing at 12:00 UTC on 26 June, any escalation in the red alert status for the Île-de-France region in the coming days could rapidly shift the conditional token prices away from the current consensus.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Paris on June 26? across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at Polymarket Legit? — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

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 Polymarket Legit?, 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.

What does it cost to trade on Polymarket Legit??

Zero. Polymarket Legit? routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

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.