Highest temperature in Madrid on July 22?

Platform comparison

Market context

Polymarket has this contract at 0% YES, so the market is effectively saying the chance of Madrid-Barajas posting a top-end reading inside the listed range before the 12:00 UTC settlement cut-off is negligible. The event itself is simple: the highest temperature recorded at Adolfo Suárez Madrid-Barajas Airport Station on 22 July 2026, as captured by Wunderground, decides the payout, with the result mapped to the relevant temperature band in Celsius.

That zero price is easiest to read against Madrid’s summer pattern rather than any single forecast run. Mid-July and late-July highs in Madrid often sit well into the 30s Celsius, but the airport station can run a little differently from the city centre, and a range market is really about where the day’s peak lands, not whether it feels hot. On Polymarket, users are buying and selling conditional tokens settled in USDC on Polygon, so the price reflects the crowd’s view of that exact station reading, not a broad weather impression. In comparable Madrid summer setups, late-morning warmth can already lock in much of the day’s high before the noon UTC end of the settlement window.

The main catalysts are the pre-market forecast updates, any heat alerts for central Spain, and whether the airport sees cloud, wind or early convective activity that caps the maximum before midday UTC. Traders also need to watch the timing carefully: the market closes at 12:00 UTC, so any move after that is irrelevant even if the local afternoon becomes hotter. In practice, this is a short-dated weather line where the opening hours of the day matter far more than the full civil afternoon.

Methodology

We track Highest temperature in Madrid on July 22? 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

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.

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.

Do I need to KYC for this market?

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