Highest temperature in Paris on June 23?

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Active sub-markets

Market context

The underlying real-world event is the peak of a historic heatwave in Paris and Île-de-France, where afternoon highs are forecast to reach 39°C with temperatures well above seasonal norms, potentially peaking near 40°C before a gradual cooling begins on Friday, 26 June[1]. This extreme thermal plateau, lasting from Monday through Thursday, directly frames the market’s 0% YES probability for lower temperature ranges, as current conditions align with the upper end of the resolution spectrum rather than the cooler brackets.

Historical June averages for Paris typically show maximums around 21°C to 22°C, but the 2026 anomaly represents a significant deviation, with daily highs ranging from 83°F to 106°F (28°C to 41°C) according to AccuWeather’s monthly forecast[2]. Comparable cases of such heatwaves in recent years demonstrate that when a sustained plateau of extreme heat occurs, lower temperature ranges become statistically improbable, explaining why the market currently dismisses cooler outcomes with near-certainty.

Traders should monitor the confirmed timing of the cooling trend expected on 26 June, as any delay in this relief could sustain peak temperatures through the settlement window, while sudden storm activity might abruptly lower the daily maximum[1]. Although no specific regulatory announcement has yet altered the market’s accessibility, the German GlüStV framework and US CFTC reach remain relevant for traders considering jurisdictional compliance, particularly given the “no-KYC up to $1,500” provision that allows immediate participation without identity verification for this specific weather event. Recent coverage from Sortiraparis confirms the heatwave’s intensity but notes the cooling forecast remains unconfirmed, making weather model updates the primary catalyst for probability shifts[1].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Paris on June 23? on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

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

Is this market available outside the US?

Polymarket KYC 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.

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 KYC 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.