Highest temperature in Amsterdam on July 16?

Platform comparison

Market context

Amsterdam Airport Schiphol will record its peak temperature for 16 July 2026, with the outcome determining which Celsius range resolves the prediction market. Historical data for mid-July in the Netherlands typically shows highs between 20°C and 25°C, though recent years have seen spikes above 28°C during heatwaves. The current crowd-implied probability of 0% for the YES outcome suggests traders expect the temperature to fall outside the specific range offered, likely aligning with the frontrunner of 25°C at 54% probability on Polymarket, while 26°C holds 23% [1]. This divergence highlights how Polymarket’s decimal odds format reveals granular sentiment compared to Kalshi’s implied probability model, where such multi-outcome distributions are often simplified.

Traders should monitor the European Centre for Medium-Range Weather Forecasts (ECMWF) daily updates for July 2026, as shifts in Atlantic pressure systems could trigger sudden heat spikes. A recent report from the Dutch meteorological service KNMI notes that July 2025 experienced a 31°C peak in Amsterdam, indicating that extreme outliers remain possible despite current low probabilities [1]. Unlike Betfair’s commission-based model or Smarkets’ lower fee structure, Polymarket’s zero-fee approach on this event may attract higher volume, potentially distorting short-term probabilities. The settlement window closing at 12:00 UTC on 16 July 2026 means late-day temperature fluctuations will not affect resolution, a constraint Kalshi traders must also navigate but which Betfair’s live markets often accommodate with real-time adjustments.

The key dependency remains Wunderground’s official record for Schiphol, which will be the sole resolution source. Any discrepancy between local station readings and airport data could create arbitrage opportunities, particularly if Kalshi’s KYC requirements limit participation compared to Polymarket’s global access. While Smarkets might offer better liquidity for hedging, Polymarket’s current 54% weighting on 25°C suggests a consensus that aligns with typical July averages, making the 0% YES probability a reflection of range mismatch rather than temperature disbelief [1].

Sources: 1

Methodology

This page compares Highest temperature in Amsterdam on July 16? 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 Kalshi Alternative UK, 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

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. Kalshi Alternative UK 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.