Highest temperature in Amsterdam on July 16?

Platform comparison

Market context

Amsterdam Airport Schiphol is set to record its peak temperature for 16 July 2026, with the market currently pricing a YES outcome at 0%, implying the crowd expects the reading to fall outside the defined range. On Polymarket, this conditional token trades on Polygon using USDC, where liquidity remains thin as traders await the official Wunderground settlement data for the EHAM station. The zero probability suggests the market anticipates a cool day, yet historical July highs in Amsterdam frequently breach 25°C, creating a stark divergence between current pricing and typical summer volatility.

Past July heatwaves in the Netherlands, such as the 2019 record of 40.75°C at Gilze-Rijen, demonstrate that extreme spikes can occur even when short-term forecasts appear benign. Schiphol’s urban location often moderates extremes compared to inland sites, but the 2023 European heat event saw Schiphol reach 36.4°C, proving that 0% pricing ignores the tail risk of sudden atmospheric shifts. Traders should view this as a mispriced outlier rather than a settled fact, given the region’s capacity for rapid temperature surges during stable high-pressure systems.

The primary catalyst is the daily 12:00 UTC settlement window, which locks in the final Wunderground reading for the day. Traders must monitor the MeteoNederland hourly forecast updates and any sudden changes in the North Atlantic pressure gradient, which can trigger rapid warming. While no specific weather announcements are scheduled for today, the dependency on real-time sensor data means the market will resolve instantly once the 12:00 UTC timestamp passes, leaving no room for late arbitrage.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.