Highest temperature in Madrid on July 12?

Platform comparison

Market context

The market resolves on the peak Celsius temperature recorded at Madrid-Barajas Airport on 12 July 2026, with the current 0% YES probability implying the crowd expects a reading outside the defined upper range. This stance ignores the intense heatwave that dominated central Spain from 4–7 July, when daytime highs hit 42°C and nights barely cooled below 29°C, pushing temperatures nearly 9°C above seasonal averages[2]. Historical data for July in Madrid typically sees highs around 35°C, but the 2026 forecast projects daily peaks between 32°C and 39°C (89°–102°F), suggesting the current probability may be mispriced if the heatwave persists or intensifies toward mid-month[1][2].

Programmatic traders should monitor the Wunderground history feed for the LEMD station, automating checks every hour to capture the daily maximum before the 12:00Z settlement cutoff. Key catalysts include the Met Office’s updated forecast for 12 July, which currently lists a maximum of 35°C but may shift if the heatwave extends beyond the 7 July end-date noted in recent updates[2][3]. A Reuters report from 21 June confirmed Spain’s first official heatwave of 2026, with temperatures reaching 40°C in Madrid, establishing a precedent for extreme readings that could recur if atmospheric conditions remain stable[4][6]. Traders building conditional orders must weight the dependency on clear skies and dry conditions, which have sustained the current scorching pattern, rather than relying solely on the average July high.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Madrid on July 12? 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 Polymarket Review UK, 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

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.

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.

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.