Highest temperature in Madrid on July 12?

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Market context

Madrid is currently experiencing its first official heatwave of 2026, with temperatures across central Spain soaring well above seasonal averages and pushing into record-breaking territory. Authorities have issued severe warnings as the region faces dangerous afternoon heat, with daytime highs in recent days reaching 42°C and overnight lows remaining uncomfortably warm near 29°C. This intense thermal pressure has dominated the weather narrative from early July, creating a backdrop where extreme heat is the prevailing norm rather than an anomaly.

Historical precedents and recent comparable cases suggest the current 0% implied probability for any specific high-temperature bracket is likely mispriced given the active heatwave. During the July 4–7 period, Madrid recorded highs of 42°C, which is approximately 9°C above the average, while Barcelona set a new maximum of 40.5°C on 8 July. The first half of 2026 has already been confirmed as Spain’s hottest ever recorded, with temperatures 1.6°C above normal levels, indicating that the atmospheric conditions favouring extreme highs are entrenched rather than transient.

Traders should monitor real-time updates from Wunderground and official bulletins from AEMET, as the settlement window closes at 12:00 UTC on 12 July. The primary catalyst is the persistence of the current heat dome, which forecasters expect to maintain temperatures above 40°C until at least 7 July, though the immediate outlook for 12 July remains critical. With thin volume on similar contracts, any updated ECMWF model output or official station data before the cutoff could trigger sharp price movements, particularly if the heatwave extends beyond the initial forecasted duration.

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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

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.

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.