Highest temperature in Madrid on July 31?

Platform comparison

Market context

Madrid’s daytime maximum at Barajas on 31 July is the resolution event, with the market settling on the highest temperature reached at Adolfo Suárez Madrid-Barajas Airport Station before the noon UTC window closes. Recent Madrid summer context is plainly hot: AccuWeather’s July pages show late-July highs around the mid-30s °C to low-40s °C depending on the station and model track, while Meteo-style daily observations for Barajas have already printed readings in the high 30s °C this week.[1][2][12][19]

For reading the current 0% implied probability, comparable July climatology matters more than the headline city forecast. WeatherSpark says Madrid’s July daily highs typically rise from about 31°C to 33°C, with extremes above 37°C being uncommon but not extraordinary; Wikipedia’s Madrid climate summary also places the city’s record heat at 40.7°C, underlining that the upper tail can be very steep in heatwave conditions.[7][11][16] For a programmatic workflow, the useful distinction is between the station-level observed maximum and any city forecast, because the settlement source is the Wunderground history page for LEMD rather than a generic Madrid forecast feed.

The main catalysts to watch are the morning evolution of the heat plume, local convective cloud, and any operational changes that affect airport readings, since the market is effectively a data-pull on one station’s observed maximum. Infobae’s Madrid forecast for 31 July pointed to a 38°C city high, which is consistent with a hot-day regime that can still overshoot or undershoot depending on timing and sunshine intensity.[4] In tooling terms, traders using bots or conditional orders would typically watch successive observation updates and a near-real-time forecast model rather than a single daily headline, because the key variable is whether Barajas prints its maximum before the settlement cutoff.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Madrid on July 31? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Kalshi Fees, which mirrors the Polymarket order book at 0% fees.

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

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.

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.

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 Kalshi Fees trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.