Highest temperature in Paris on July 22?

Platform comparison

Market context

The Paris-Le Bourget Airport reading for 22 July 2026 is the event being priced, with settlement tied to the day’s maximum temperature in Celsius from the specified Wunderground history page. On Polymarket, the contract is already tightly centred on the mid-20s, with 25°C and 26°C each shown at 50%, which implies the market is effectively split between two adjacent outcomes rather than assigning weight to a hotter extreme.[1]

That shape is consistent with a summer temperature distribution where small forecast errors matter more than broad directional calls. In practical terms, a one-degree shift around the expected peak can flip the contract’s payout band, so the current 0% YES figure should be read as a pricing artefact rather than a meaningful view that the event is impossible; the live order book instead suggests near-equal odds between the two most likely buckets.[1]

For traders, the main catalysts are the latest local forecasts, any revisions to heat expectations in north-east France, and the airport station’s actual afternoon maximum as the day progresses, since the market resolves off the highest observed reading rather than a forecast high. A late move in cloud cover, wind, or storm timing can still re-rank the final temperature band, especially when the market is balanced this closely; the key comparison point is whether other venues or analysts are leaning above or below the 25–26°C zone, because any divergence from the exchange’s split pricing would indicate where the consensus is misaligned.[1]

Sources: 1

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, which mirrors the Polymarket order book directly.

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

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 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?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Best Prediction Markets trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.