Highest temperature in Madrid on July 21?

Platform comparison

Market context

On 21 July 2026, Madrid's highest temperature will be recorded at Adolfo Suárez Madrid-Barajas Airport, the official weather station used for settlement. The market currently prices at 0% YES across all temperature ranges, reflecting the settlement window's closure before any actual data becomes available. Polymarket's conditional token structure on Polygon means traders are locking USDC into positions that resolve only once Wunderground publishes the historical temperature record for that specific date and station.

Madrid's July climate presents a narrow band of likely outcomes. Historical data from the airport station shows July highs cluster between 32–36°C, with extremes reaching 40°C during heat waves. The city experienced a 40.5°C peak in July 2022 and regularly sees temperatures above 35°C throughout the month. This consistency means the market's current zero probability reflects pure temporal mechanics—the event hasn't occurred yet—rather than any genuine uncertainty about whether Madrid will record *some* high temperature on that date.

Traders monitoring this contract should track European summer weather patterns as July 2026 approaches, particularly Atlantic pressure systems and Saharan heat advection forecasts issued in late June. Spain's national meteorological agency (AEMET) publishes monthly outlooks that typically signal whether anomalous heat is expected. The settlement depends entirely on Wunderground's historical archive for LEMD station data, which updates automatically once the date passes. No announcements or schedule changes affect the underlying event itself—only the accuracy of the final temperature recording matters for resolution.

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 Polymarket Scam?, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

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.

Do I need to KYC for this market?

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