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. The settlement window closes at 12:00 UTC on that date, capturing the highest reading from the official station as logged by Wunderground.

Historical July highs in Amsterdam typically cluster between 22°C and 28°C, with 25°C being the most frequent peak in recent decades. The current crowd-implied probability of 0% for the YES outcome appears inconsistent with Polymarket’s active trading, where 25°C holds a 54% frontrunner position and 26°C follows at 23%[1]. This divergence suggests either a mispricing in the specific contract referenced or a discrepancy in how the YES condition is defined across platforms, as comparable markets show strong consensus around mid-20s temperatures rather than near-zero likelihoods.

Traders should monitor daily weather forecasts from the Netherlands’ Royal Meteorological Institute (KNMI) released each morning, as well as real-time updates from Wunderground’s hourly archive for EHAM. Any sudden shift in European heatwave patterns or cloud cover forecasts ahead of 16 July could materially alter the implied distribution. With no major announcements scheduled, the primary catalyst remains the evolving synoptic pressure system over the North Sea, which historically dictates summer temperature extremes in the region.

Sources: 1

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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Best Prediction Markets trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.