Highest temperature in Madrid on July 12?

Platform comparison

Market context

Madrid is currently experiencing the tail end of an intense summer heatwave that has pushed temperatures across central Spain well above seasonal norms, with daytime highs in early July reaching 42°C. The prediction market for the highest temperature on 12 July 2026 at Madrid-Barajas Airport shows a 0% implied probability for the YES outcome, suggesting the crowd expects the temperature to fall outside the specific range offered in this contract. This near-zero pricing contrasts sharply with the market’s behaviour on the 5 July contract, where the 39°C outcome was priced at 56.5% despite similar heat conditions, highlighting how discrete temperature brackets create divergent odds even within the same weather event [1][3].

Historical data from the 2026 European heatwaves shows Barcelona hit 40.5°C on 8 July, setting a record maximum since records began, while Madrid saw temperatures up to 40°C during the first official heatwave of 2026 on 21 June [5][6]. The first half of 2026 was Spain’s hottest ever recorded, with temperatures 1.6°C above normal, indicating that extreme heat is the baseline rather than an anomaly this year [10]. Traders should watch the daily ECMWF and AEMET forecast updates, as thin volume in these weather contracts means any shift in model output before the 12:00 UTC settlement cutoff could move prices sharply, similar to the volatility seen in the July 5 market [1]. The resolution source is Wunderground’s daily history for LEMD, so traders must monitor real-time station data rather than relying solely on regional forecasts [1].

Sources: 1 · 2 · 3 · 4 · 5

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 PolyGram, 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

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 PolyGram. 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 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.