Highest temperature in Paris on July 23?

Platform comparison

Market context

Paris’s afternoon peak on 23 July is the real-world event, and the market is currently pricing **25°C** as the clear favourite at **100% implied probability**, with the rest of the ladder effectively left as underdogs. That makes the consensus very one-sided: the crowd is behaving as if the day will land in a fairly ordinary summer band rather than testing any hotter bucket.

The historical frame backs that caution. July in Paris is typically a mid-20s affair, with average highs around **26°C** and the usual daily range sitting well below heatwave territory, although the month can occasionally spike far higher in extreme years.[2][3][5] For a handicapper, the value question is therefore not whether Paris is usually warm, but whether the day can break out of the normal corridor; a 25°C favourite looks logical if the forecast remains merely seasonal, while contrarian upside only comes into play if a hotter afternoon develops than the market is implying.

The key catalyst is the live weather pattern on the day: cloud cover, any late-afternoon heating, and whether showers or sea-breeze effects cap the maximum before the airport station’s daily peak is logged. A recent local forecast for 23 July pointed to partly cloudy skies and temperatures between **15°C and 28°C** in Île-de-France, which supports a modestly warm but not extreme reading.[4] With settlement tied specifically to the highest temperature recorded at Paris-Le Bourget Airport Station on Wunderground, traders should watch the station’s observed maximum rather than city-centre headlines, because small location differences can decide which bracket wins.[1]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Paris on July 23? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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

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 Who Will Win 2026. 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 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.