Highest temperature in Madrid on August 9?

Platform comparison

Market context

Madrid’s 9 August heat reading is now effectively a question of *which* hot outcome the airport station lands in, rather than whether it will be hot at all. Polymarket is already showing 37°C at 100%, while the live comparison set you supplied has no meaningful sportsbook-style analogue and the contract’s own crowd price leaves the lower bands near zero, implying the market has compressed the forecast into a single bucket rather than a spread of possibilities.[1]

That has some historical logic: Madrid’s August climatology commonly sits around the low 30s Celsius, but recent forecast services are pointing above that normal range, with official-style and commercial forecasts clustering near 36–38°C for the day.[3][4][11][13] The important comparison here is that the airport station can run a touch differently from city-centre references, so traders should separate broad “Madrid” forecasts from the contract’s resolution point at Adolfo Suárez Madrid-Barajas Airport; the market’s 37°C pricing looks consistent with those higher-end forecasts, while a 36°C print would still be plausible enough to matter because the contract resolves by the exact temperature band recorded in the daily observations table.[3][11][18]

The main catalysts are the day’s observation cycle and any late forecast updates from AEMET or major weather providers before the midday UTC cutoff, since the settlement source depends on the station’s recorded maximum rather than a summary graphic.[11][3] On a day with a strong heat warning, the final bucket will usually hinge on whether the airport reaches the upper mid-30s before temperatures ease later in the afternoon; AccuWeather’s warning for a maximum near 38°C and local reporting around 36°C show the key divergence traders are watching is a one- to two-degree band, not a change in the overall hot regime.[10][11]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Madrid on August 9? 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

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

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 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 PolyGram 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.