Highest temperature in Madrid on July 24?

Platform comparison

Market context

Madrid’s outcome will be set by the **highest temperature at Adolfo Suárez Madrid-Barajas Airport** on 24 July, and the live market currently implies a modestly hot afternoon rather than an extreme spike. Polymarket’s crowd is clustered around **34°C and 35°C**, with 34°C leading at 37% and 35°C close behind at 34%, while the contract’s 0% Yes reading on the current market interface is inconsistent with those listed outcome prices and should be treated cautiously as a platform-specific quirk rather than a true weather view.[2]

For context, July in Madrid is typically very hot, with daytime temperatures often climbing above **35°C** and nights not falling much below **21°C**; rain is usually rare to nonexistent, so cloud or precipitation is not normally the main brake on highs.[1] That background makes the market’s centre of gravity around the mid-30s broadly in line with seasonal expectations, but it also means the tail risk is to the upside if a strong heat plume reaches central Spain. Recent commentary on Spain’s summer pattern has pointed to repeated heat episodes across central Spain, with Madrid potentially reaching the high 30s under the hottest setups, which is the main reason traders are pricing a meaningful chance of 35°C rather than anchoring to a lower summer norm.[3]

The key catalyst is the short-range forecast for the Madrid airport specifically, because a few tenths of a degree can move the winning bucket between adjacent outcomes. Traders should watch the evolution of any **North African air mass**, overnight minimums, wind and cloud cover, and whether forecasts for central Spain are nudged up or down as the day develops; in a market resolved on a single station’s daily maximum, those details matter more than citywide averages.[1][3]

Sources: 1 · 2 · 3

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

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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 Best Prediction Markets. 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.

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.

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.