Highest temperature in Madrid on July 22?

Platform comparison

Market context

The key event is whether Madrid’s airport station records a **39°C-plus** high before the market’s midday UTC settlement cut-off, with Wunderground used for resolution. Polymarket’s order book is already leaning heavily to **39°C** at **77%**, with **40°C** next at **21%**, which implies the crowd sees a one-degree band as the main decision point rather than a broad temperature range.[1]

That reading fits the broader July pattern in central Spain: mid-summer heat in Madrid commonly sits in the high 30s, and contemporaneous Spanish coverage today cites a forecast maximum of **39°C** with **0% rain** and very low cloud cover.[2][4] On a platform-comparison basis, Polymarket displays this as explicit implied probability, while Kalshi-style contracts are usually quoted as decimal prices, so the same view may look different even when the underlying expectation is similar. Betfair and Smarkets also tend to surface market depth and matched prices rather than a single headline probability, and their fees can make the practical break-even differ from the quoted number; that matters most in tight weather bands like this one, where a move from 39°C to 40°C can shift the entire payout.[1]

For traders, the main catalysts are the final official forecast updates, any heat advisories, and whether Madrid’s afternoon maximum lands early enough to be captured before settlement. A late-day surge in temperature still counts if it is logged by the source station before 12:00 UTC on 23 July local-equivalent terms, so the exact timing of the daily high matters as much as the headline forecast. If the expected maximum stays pinned near 39°C, the market should remain sensitive to small revisions in cloud cover, wind, and the persistence of the Iberian heat pattern already visible in today’s Spanish reporting.[2][3]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Madrid on July 22? 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 Robinhood Prediction Markets, 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

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

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.

Which platform is accessible globally?

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

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Robinhood Prediction Markets offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.