Highest temperature in Madrid on June 29?

Platform comparison

Market context

Madrid’s June climate typically sees daytime highs around 28°C, with low humidity and ten hours of daily sunshine, making extreme heat uncommon under normal conditions[1][2]. Historical records show the warmest average day in June is 30 June, reaching 31.8°C, while the highest recorded temperature in the month was 40.7°C on 28 June 2019[5][9]. Given that the current crowd-implied probability for a high temperature above typical ranges is 0% YES, this aligns with long-term averages where June 29 rarely breaches 35°C, suggesting the market correctly prices in the absence of a heatwave.

Traders should monitor real-time weather feeds from Wunderground for the Adolfo Suárez Madrid-Barajas Airport Station, as settlement depends entirely on the highest temperature recorded at that site on 29 June 2026[1]. A recent heatwave in late June 2026, which saw temperatures exceed 110°F (43°C) in parts of Spain and caused 212 excess deaths, underscores the volatility of extreme weather events, though it occurred before the settlement date[3]. Programmatically, power-users would deploy bots to scrape Wunderground’s hourly data, cross-reference with MeteoSpain alerts, and execute conditional orders if temperatures approach 35°C, ensuring automated responses to sudden spikes without manual intervention.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Madrid on June 29? 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 Kalshi Fees, which mirrors the Polymarket order book at 0% fees.

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 Kalshi Fees. 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 Kalshi Fees 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.