Highest temperature in Madrid on August 7?

Platform comparison

Market context

Madrid’s temperature at Barajas on 7 August will be read from the station’s observed daily maximum, not a summary graphic, so the market is ultimately about the official intraday peak rather than the rounded headline forecast. The crowd is still pricing **0% YES**, which is far below the live weather forecasts pointing to a hot afternoon: one marketplace model currently clusters most probability around **38–39°C**, while another forecast says **36°C/22°C** for the day and a Spanish news forecast puts the maximum near **37.9°C**.[2][7][5]

That gap matters because Madrid’s early-August climate can support low-to-mid 30s on an average day, but heatwave episodes regularly push the city into the high 30s or around 40°C. Reuters reported Madrid in a first official heatwave of 2026 with temperatures reaching **40°C** in June, and AccuWeather has also issued a **moderate high-temperature warning** for the area with a **37°C** maximum.[13][4] In comparative terms, the current market looks materially more sceptical than both the forecast stack and the recent heat-risk backdrop, so the implied probability appears to be discounting either a miss on the station reading or a narrow temperature band that avoids the highest listed ranges.[2][4][13]

For traders, the main catalysts are the afternoon evolution of cloud cover, wind and any late-shift in the day’s heat advisory, because the settlement source is a single airport station observation rather than a citywide estimate. Spain’s national weather coverage on 7 August described widespread inland highs above **35°C** and locally higher readings across the peninsula, which supports the idea that a modest uptick in observed Madrid readings would not be unusual on a day like this.[8] The key comparison to watch is whether live prediction-market pricing moves towards the weather forecasts as the day warms, or stays anchored below them despite the heat warning and the broader August climatology.[2][4][10]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Best Prediction Markets, which mirrors the Polymarket order book directly.

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.

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 Best Prediction Markets 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.