Highest temperature in Paris on July 26?

Platform comparison

Market context

Paris’s 26 July maximum will be judged by the highest Celsius reading recorded at Paris-Le Bourget Airport, so the key question is whether the city gets an ordinary summer afternoon, a brief spike, or an outlier hot spell. The market is currently pricing the 24°C outcome as the front-runner at 34%, with 23°C next at 32%, while a 0% crowd-implied chance on the overall YES side suggests traders are treating the contract as already unlikely to land in any higher bucket or are focused on a different strike structure.[1]

That pricing sits close to the broad July climatology for Paris, where third-party forecast pages describe typical July highs around 25°C and a mix of showers and breezy conditions rather than sustained heat.[2][3] In other words, the market is not implying an extreme-temperature event; it is clustered around the seasonal centre of gravity. For comparison, a reading near 24°C would be consistent with a normal Paris summer day, while anything materially above that would require a warmer-than-usual air mass or strong sunshine with limited cloud cover.[1][2][3]

Traders should watch the final Paris-area forecast cycle, especially late updates on cloud cover, wind and rainfall timing, because even small shifts can move the peak temperature by a degree or two. Local heatwave guidance also matters: midday-to-afternoon heating is most sensitive to clear skies and calm air, while showers or thicker cloud can cap the day below the market’s top buckets.[4] Since settlement uses the Paris-Le Bourget station’s recorded high, the decisive catalyst is not the city average but the specific airport observation on the day.[1]

Sources: 1 · 2 · 3 · 4

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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. 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.

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.

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.