Highest temperature in Madrid on June 29?

Platform comparison

Market context

The underlying real-world event is straightforward: what will be the highest temperature recorded at Madrid-Barajas Airport on 29 June 2026, measured in degrees Celsius. On Polymarket today, this contract trades with a 0% implied probability for the “YES” outcome, suggesting the crowd believes the temperature will fall outside the specific range being wagered on. The market resolves based on Wunderground’s official daily high for that station, with settlement closing at 12:00 UTC on 29 June 2026, and trades settle in USDC on the Polygon network using conditional tokens.

Historical June data frames this 0% probability as plausible but not definitive. Madrid’s average June high sits near 39°C (99°F), yet the first official 2026 heatwave already pushed temperatures to 40°C (104°F) on 21 June, with some areas exceeding 43°C (110°F) [3][6]. Recent records show Madrid experienced its warmest night ever in June 2026, with temperatures not dropping below 26.2°C (79.2°F) [4]. Given this extreme volatility, a 0% crowd-implied probability may reflect overconfidence rather than certainty.

Traders should monitor the Met Office’s daily forecasts for Madrid, which currently predict a maximum of 33°C for 29 June, rising to 36°C on 30 June [1]. However, the Reuters report on Spain’s sweltering heatwave warns that such forecasts can shift rapidly during active heat events [3]. Key catalysts include the European Environment Agency’s heat alerts, any new official declarations of heatwaves, and Wunderground’s real-time updates for LEMD. The US Embassy’s June 23 alert noted temperatures exceeding 110°F are possible, underscoring the risk of sudden spikes [6]. Conditional token positions remain sensitive to these dependencies until settlement.

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 Polymarket Scam?, which mirrors the Polymarket order book directly.

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 Polymarket Scam?. 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.

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.