Highest temperature in Madrid on August 17?

Platform comparison

Market context

On 17 August 2026, Madrid's highest temperature will be recorded at Adolfo Suárez Madrid-Barajas Airport Station and resolved against Weather Underground's Daily Observations table. The crowd currently assigns zero probability to any outcome occurring, suggesting either extreme confidence in a specific temperature band or minimal trading activity. Madrid's August climate is characteristically hot and dry, with daily highs routinely exceeding 35°C during mid-month, making temperatures in the 36–40°C range historically typical for this date.

Historical data from Madrid's airport station shows August 17 temperatures have ranged between 32°C and 39°C over recent decades, with the most frequent outcomes clustering around 36–38°C. The 0% implied probability across all ranges signals either a technical issue with market liquidity or traders awaiting clearer atmospheric forecasts before committing capital. Given Madrid's consistent summer heat patterns and the absence of anomalous climate signals for 2026, the consensus implicitly favours mid-to-high 30s outcomes, though the complete absence of probability distribution across temperature bands suggests limited market depth rather than genuine certainty.

Traders should monitor European summer weather patterns from June onwards, particularly Atlantic pressure systems and any heat dome formations that might push temperatures toward 40°C or higher. The Spanish meteorological agency (AEMET) typically issues reliable 10-day forecasts by early August, providing concrete data points closer to settlement. Any unusual atmospheric conditions—such as Saharan dust intrusions or persistent high-pressure systems—could shift outcomes materially, creating value opportunities for contrarian positions if the market remains illiquid through mid-August.

Methodology

This page reviews Highest temperature in Madrid on August 17? 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 Who Will Win 2026, which mirrors the Polymarket order book at 0% fees.

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 Who Will Win 2026. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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 Who Will Win 2026 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.