Highest temperature in Madrid on August 9?

Platform comparison

Market context

Madrid is trading as a **near-certain hot day**, but the market’s **0% YES** crowd price sits awkwardly against forecast highs clustered around **36–39°C** and several sources pointing to a maximum near **36°C** for the capital, with the airport often a touch warmer than the city core.[3][6][9][12] For a handicapper, that makes **YES the favourite** on the meteorological setup, while **NO** is the crowd’s de facto position; the value angle is that the market resolves on the **highest reading in Weather Underground’s Daily Observations at Madrid-Barajas**, not the summary high, so the relevant number is the station’s actual peak, not the headline forecast.

Historically, Madrid in August is a high-variance heat market, with average monthly highs in the low-to-mid 30s Celsius and occasional surges well above that, including airport readings approaching 40°C in recent observations for the region.[8][12][16] Comparable forecasts and climate normals suggest that a result in the **mid-to-upper 30s** is more typical than an extreme breach, which puts the key strike zone around the market’s nearby Celsius bands rather than a long-shot outlier.[3][8] That framing leaves the **contrarian angle** on a hotter-than-expected airport reading, especially if local convection is absent and the day runs full sun.

The main catalysts are straightforward: the **intraday peak at Barajas** and whether the airport station edges above the city forecast, because settlement ends at **12:00 UTC** and only the Day Observations table counts.[13] Forecast sources have been aligned on **sunny, very hot conditions** with limited rain risk, so there is no obvious weather-system shock to watch; the practical swing factor is whether the station manages to touch the top of the expected range before the cut-off.[2][6][9] In market terms, the consensus sits around **high-30s Celsius**, while value may sit in the **next band up** if the day overperforms the modelled high by a degree or two.[3][6][12]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Madrid on August 9? 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

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

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.

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.

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.