Highest temperature in Madrid on June 28?

Platform comparison

Market context

The real-world event is an unprecedented June heatwave scorching Spain, with temperatures exceeding 110°F in some regions and official records shattered across the country. Madrid has already endured days reaching 40°C, and the Adolfo Suárez Madrid-Barajas Airport Station is under intense thermal pressure as the settlement window for this prediction market draws to a close.

Historical data frames the current 0% crowd-implied probability for a specific temperature range as highly questionable. On 28 June 2019, Madrid recorded its highest temperature of 40.7°C, a benchmark that remains relevant given this year’s historic heatwave. Recent records show Cantabria hitting 43.7°C and Madrid experiencing its warmest night ever, with temperatures not dropping below 26.2°C, suggesting the airport station could easily surpass previous highs despite the market’s pessimistic stance[3][5][9].

Traders should monitor real-time updates from Wunderground, the official resolution source, alongside ongoing heatwave declarations from the Spanish meteorological agency. The market leans heavily on the immediate catalyst of this week’s record-breaking temperatures, which have already caused hundreds of excess deaths and prompted emergency alerts from the US Embassy[1][6]. With no scheduled political debates or campaign-finance disclosures influencing weather patterns, the sole driver is the relentless progression of this summer’s extreme heat, as confirmed by Reuters and AccuWeather forecasts[2][4].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page tracks Highest temperature in Madrid on June 28? across four political prediction venues. Live odds come from the Polymarket order book (the deepest political prediction-market book). Kalshi is the CFTC-regulated US alternative, Betfair the established UK sports-exchange with politics markets, Manifold the open play-money variant. For users geo-blocked from Polymarket directly, brokers like Election Predictions UK provide a 0%-fee route into the same order book.

Resolution & payout

For political markets the resolution source is decisive. Polymarket defines a concrete source per contract (e.g. AP, Reuters, official electoral commission) and uses the UMA Optimistic Oracle as the on-chain dispute mechanism. With a clearly defined outcome the USDC payout lands within minutes of the final confirmation.

FAQ

What resolution source is used for elections?

Polymarket defines the source per contract — usually Associated Press (AP Race Call), Reuters or the official electoral commission. The source is stated in contract details before the market opens.

Which platform has the deepest political liquidity?

Polymarket — by far. US 2024 presidential volume was ~$3.5B vs Kalshi (~$200M) and Betfair (~$120M). Where Polymarket is geo-blocked, brokers like Election Predictions UK route into the same order book at 0% fees.

Are political prediction markets legal in my country?

It varies. They sit in legal gray areas in most jurisdictions. Polymarket is geo-blocked from US/UK/EU; some broker frontends have a different geo footprint. Trade only with capital you can afford to lose, and only if you understand the legal status in your jurisdiction.

Why do Polymarket and Kalshi differ on elections?

Kalshi must follow CFTC compliance — strict definitions, clear resolution sources, US citizens only with KYC. Polymarket operates globally without CFTC oversight — deeper liquidity, but also higher regulatory risk.

Which political events have the biggest volume?

US Presidential election, party nominations (DNC/RNC), Senate majorities, individual state outcomes (Pennsylvania, Michigan, Wisconsin), and major European elections. Peak markets reach $50-500M per event.