Highest temperature in Madrid on July 24?

Platform comparison

Market context

Madrid’s July heat is usually decided by whether the airport station peaks in the low, mid or upper 30s Celsius, and the current 0% YES reading looks materially out of line with the live market pricing. On Polymarket, the leading outcome is **33°C at 64%**, with **34°C at 20%**, which implies traders are leaning towards a warm but not exceptional maximum rather than a breakout above the mid-30s.[1] That matters because the contract settles on the **highest temperature recorded at Adolfo Suárez Madrid-Barajas Airport Station on 24 July 2026**, so the exact daily peak, not the all-day average, is what counts.[1]

Historically, Madrid in July often sits in a hot but relatively predictable band, with published July guidance describing daytime temperatures above 35°C as common and nights that stay warm.[3] That context suggests the main debate is whether the airport station lands near the modal low-30s outcome or pushes into a hotter range if a broader Iberian heat episode verifies. A recent heatwave forecast for Spain said central areas, including Madrid, could see **37-41°C** highs, but that is a broad regional outlook rather than a station-specific settlement call, so it should be treated as directional rather than decisive.[4]

For traders, the main catalysts are the final daytime forecast updates, any late shifts in the Iberian ridge pattern, and whether Madrid’s airport sits on the edge of a hotter inland air mass rather than under a sea-breeze-modified setup. Cross-platform pricing is already showing divergence: the market-implied probability on Polymarket is concentrated in **33°C**, while the stated crowd-implied **0% YES** reading suggests either a different strike definition or a disconnected quote on another venue, so the contract should be checked against the exact resolution bands before relying on headline odds.[1]

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 Kalshi vs Polymarket. 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.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.