Highest temperature in Madrid on July 24?

Platform comparison

Market context

Madrid’s highest temperature for 24 July will be set by the day’s peak reading at Adolfo Suárez Madrid-Barajas Airport, so the key question is whether the airport reaches one of the hotter July bands rather than merely sitting near the city average. July in Madrid is typically very hot: sources put average daytime highs around 33–35°C, with very little rainfall and plenty of sunshine, which makes a hot-close and higher spike the default summer pattern rather than an outlier.[1][2][4]

That historical backdrop helps explain why a 0% crowd-implied probability on the YES side looks extreme for a mid-summer Madrid temperature event. On event-style markets, a zero quote often reflects thin early liquidity or a mismatch between the platform’s contract ranges and traders’ weather expectations, rather than a literal belief that the temperature will stay below every listed threshold; this is especially relevant when comparing Polymarket’s implied-probability display with Kalshi’s and Betfair’s odds-based interfaces, and with Smarkets’ exchange pricing and fee treatment. The settlement source is Wunderground’s airport station history page, so traders should watch for the day’s actual airport maximum rather than forecasts for central Madrid.[5]

For catalysts, the main inputs are the morning forecast updates, the afternoon heating profile, and any unexpected cloud cover, wind shift, or dust/haze that could clip the peak before the settlement window closes at 12:00 UTC. In practice, Madrid’s July weather is usually stable and dry, with average rain chances near zero and hot conditions building through the month, so the biggest move tends to come from whether the airport reaches the upper-30s °C or stays a couple of degrees lower than the citywide average.[1][4][5]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Madrid on July 24? 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

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

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.