Highest temperature in Madrid on July 12?

Platform comparison

Market context

Madrid is currently experiencing a scorching summer day, with the official high at Barajas Airport reaching 82°F (28°C) as evening approaches on 12 July 2026 [4]. This specific reading sits well below the intense peaks seen earlier in the month, where a heatwave pushed temperatures to 42°C (107°F) on 5–6 July, marking the highest maximums since records began in some areas [3][6]. The crowd-implied probability of 0% for any extreme outcome reflects this immediate reality: the current day is significantly cooler than the record-breaking week that preceded it, suggesting the market has correctly priced in a lack of extreme heat for this specific date compared to the July 4–7 anomaly.

Traders monitoring this market should note that settlement relies exclusively on Wunderground data for Barajas Airport, a site that often records slightly lower peaks than the surrounding metropolitan Sierra zones which hit 37°C during the recent alert [8]. Unlike Kalshi or Betfair, which typically utilise decimal odds and stricter KYC protocols, Polymarket’s implied probability structure here offers a direct 0% view without the fee drag common on Smarkets, though the lack of liquidity on such a specific date limits depth [1]. The divergence in book mechanics is stark: while traditional books might list this as a long-odds event, the zero probability here indicates a consensus that the heatwave has already broken, with no further meteorological catalysts expected to reignite temperatures above 40°C before the 12:00 UTC settlement window closes.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Madrid on July 12? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Polymarket Alternative, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). On-chain settlement clears in minutes — the fastest payout path of the four.

FAQ

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

What about Smarkets as an alternative?

Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Polymarket Alternative has a different geo footprint and routes to Polymarket's order book at 0% fees.

Are all these platforms regulated?

No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.