Highest temperature in Paris on July 3?

Platform comparison

Market context

Paris is bracing for a powerful heatwave on 3 July 2026, with temperatures sharply rising well above seasonal averages across northern France and the Paris region, driven by intense sunshine, dry conditions, and minimal overnight cooling relief[2].

Historical precedents frame this 0% YES probability on the highest temperature being below 28°C as highly questionable, given that recent heatwaves in June 2026 saw Paris hit nearly 41°C, and the current forecast for 3 July predicts afternoon highs of 36°C to 37°C[2][3][4]. While the June event was more widespread, the new heatwave is expected to reach 36°C to 38°C in the Paris region, making a sub-28°C outcome statistically improbable compared to the 78% market probability assigned to 28°C on Polymarket[1][3].

Traders should monitor real-time updates from Météo France and Wunderground, which projects highs of up to 37°C (99°F) for Paris on this date, alongside the absence of rain and the persistence of high UV levels that will sustain peak temperatures[2][10]. The settlement window ends at 12:00 UTC on 3 July, so any divergence between the forecasted 36–37°C peak and the current 0% implied probability for higher ranges represents a significant odds mismatch against the consensus view of a scorching day[2][3].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Best Prediction Markets 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?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Best Prediction Markets UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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.

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.