Highest temperature in Paris on June 23?

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Market context

The real-world event driving this market is the peak of a historic heatwave currently sweeping Paris and Île-de-France, with temperatures plateauing near 40°C midweek before easing slightly later in the period. This intense thermal pressure has already pushed the city to record-breaking highs, including a new June record of 37.7°C and a warmest night for the month where temperatures did not drop below 24.2°C[2].

Historical precedents frame the current 0% YES probability as a likely mispricing, given that June 2026 is defined by extreme heat rather than typical seasonal variability. Previous records for June in Paris were set in 1947 at 37.6°C, yet forecasts indicate temperatures could obliterate this threshold by reaching 40°C this week[4]. The persistence of this heat dome across Europe suggests that the highest temperature on 23 June will almost certainly fall within the upper resolution ranges, making the current zero probability statistically inconsistent with the observed meteorological data[1].

Traders approaching this market programmatically should monitor the specific hourly temperature logs from the Paris-Le Bourget Airport Station on Wunderground, as the settlement relies on the single highest recorded value for the day. Key catalysts include the French weather agency’s alert status, which currently covers more than half of the country and forecasts peaks at 40°C with nighttime lows remaining above 20°C[2]. Recent reporting from The New York Times confirms that forecasters expect Paris to hit 40°C this week, an unprecedented level for June that directly contradicts the market’s current settlement expectation[8]. Conditional orders should be triggered by any deviation in the hourly forecast updates, as the heatwave’s plateau through Thursday ensures sustained high temperatures on the settlement date[1].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote (Polymarket), four reference venues with their key attributes, and a single execution path — every trade button routes to Polymarket Review UK, which mirrors the Polymarket order book directly.

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 Review 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.

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 Review 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.