Highest temperature in Madrid on July 21?

Platform comparison

Market context

Madrid's highest temperature on 21 July 2026 will be measured at Adolfo Suárez Madrid-Barajas Airport, the official weather station for the city. The settlement window closes at noon UTC on that date, capturing the peak temperature recorded across the full calendar day. Current crowd-implied probability sits at 0% YES, suggesting either extreme confidence in a specific temperature range or insufficient liquidity to establish meaningful odds across available brackets.

Historical July temperatures in Madrid provide the essential baseline for calibrating expectations. The city's average high in July ranges between 32–34°C, with typical daily maxima clustering around 33°C. The airport station has recorded July highs exceeding 40°C in roughly one-third of years since 2000, with the absolute maximum reaching 42.2°C in July 2015. Recent summers have shown increased frequency of temperatures above 38°C, though 2024 and 2025 data remain the most relevant comparators for assessing whether warming trends will persist into 2026.

Traders should monitor European weather forecasting updates from mid-July 2026, particularly from AEMET (Spain's national meteorological agency) and Météo-France, which typically issue reliable 10-day outlooks by early July. Heat-dome formation across southern Europe—driven by Atlantic pressure patterns and Saharan air masses—represents the primary catalyst for extreme readings. Any significant divergence between sportsbook temperature lines and prediction-market brackets would indicate mispricing relative to historical volatility and seasonal norms.

Methodology

This page reviews Highest temperature in Madrid on July 21? 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 vs Polymarket, 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

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.

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