Highest temperature in Madrid on July 24?

Platform comparison

Market context

Polymarket currently prices this contract with **34°C** as the leading outcome at **37%**, closely followed by **35°C** at **34%**, so the market is effectively clustering around the mid-30s Celsius rather than the extreme tails. The shares are cash-settled through Polymarket’s usual on-chain structure: traders post and swap **USDC** on **Polygon**, and the correct conditional token pays **$1** if the recorded highest temperature at Adolfo Suárez Madrid-Barajas Airport Station falls in that range. [1]

For context, Madrid’s July climate is already firmly hot: recent weather summaries describe daytime highs above **35°** as normal in the month, with very little rain and modest overnight relief. [2][4] That makes a 0% implied chance on **YES** for any given narrow range notable only as a market price, not as a statement about the physical forecast; historically, late-July Madrid often sits in a band where small shifts in heat intensity or cloud cover can move the day’s maximum between adjacent outcome buckets. [2][4]

A trader should watch the evolution of the local forecast for Madrid, especially any updates on heat build-up, cloud cover and wind, because the market resolves on the **day’s peak temperature at the airport station**, not the city average or the forecast high quoted elsewhere. WeatherSpark notes July humidity is typically very low in Madrid, which means afternoon heating can be efficient and intraday spikes matter more than broad daily averages. [3] The practical catalyst is therefore the sequence of forecast revisions before the settlement window closes, since even a one-degree move can shift value between neighbouring tokens.

Sources: 1 · 2 · 3 · 4

Methodology

We track Highest temperature in Madrid on July 24? 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 PolyGram. 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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like PolyGram 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.